Nham Mountain Direction in the 24 Mountain Directions of Feng Shui - Meaning and Interpretation

Where does the Nhâm mountain sit on the compass, and why is its position derivable rather than memorised?

The Nhâm mountain sits at roughly 337.5° to 352.5° on the compass ring, that is, in the North, slightly tilted toward the Northwest relative to the true North axis. It is the 24th mountain in the ring of 24 mountains, if you count clockwise from Tý at true North.

This position does not need to be memorised, because it can be derived with simple arithmetic. The compass ring has 360°, divided evenly among 24 mountains, so each mountain takes exactly 15°. The four cardinal directions East, West, South, North sit at 0°, 90°, 180°, 270°. The mountain at the exact centre of each direction carries that direction's name: Tý at true North (0°), Ngọ at true South (180°), Mão at true East (90°), Dậu at true West (270°). From those four anchors, 7.5° to each side is the neighbouring mountain, and from there you simply add or subtract 15° for each following mountain.

Specifically, Tý occupies 352.5° to 7.5°, with 0° as its centre. The neighbouring mountain immediately before Tý, counting clockwise back toward the Northwest, is Nhâm, occupying 337.5° to 352.5°. The neighbouring mountain after Tý, toward the Northeast, is Quý, occupying 7.5° to 22.5°. The three mountains Nhâm, Tý and Quý together form the three-mountain group of the North direction, each 15°, adding up to exactly 45° for the whole North direction.

So to know where the Nhâm mountain is, you only need to remember the four central mountains of the directions, then count 15° per step. There is no magic here, only the even division of the 360° circle into 24 parts.

Which trigram does the Nhâm mountain belong to in the Later Heaven bagua, and which three mountains share that trigram?

The Nhâm mountain belongs to the Khảm trigram in the Later Heaven bagua. This is the only correct trigram, and there is no other assignment in the 24 mountain system.

A clear distinction is needed between trigram and direction, because the two concepts are often mixed up. The North direction is one of the eight geographical directions, spanning 45° around the 0° axis. The Khảm trigram is one of the eight gua of the Later Heaven bagua, and in the 24 mountain division, the Khảm trigram corresponds to exactly the 45° of the North direction. In other words, the North direction is a geographical concept, while the Khảm trigram is a gua principle concept. They coincide in degree range, but they are not identical in nature.

The three mountains sharing the Khảm trigram are Nhâm, Tý and Quý. Among them Tý is the central mountain, that is, the Thiên nguyên long (Heavenly origin dragon), sitting at the exact centre of the trigram. Nhâm and Quý are the two flanking mountains. These three mountains divide the 45° of the Khảm trigram evenly, each taking 15°.

One detail that easily causes confusion: the four principal gua Khảm, Ly, Chấn, Đoài have no mountain carrying their own name, because those four positions are already occupied by the four branches Tý, Ngọ, Mão, Dậu. Only the four corner gua Càn, Khôn, Cấn, Tốn have mountains carrying the gua name. This is why the Khảm trigram contains the Nhâm mountain, yet no mountain is named Khảm.

What is the Five Elements attribute of the Nhâm mountain, and why do two answers not contradict each other?

Considering the Five Elements of the Heavenly Stem itself that names the mountain, Nhâm belongs to the Water element. Nhâm is the ninth stem in the ten Heavenly Stems, belonging to Yang Water, symbolising great waters, rivers and seas, strong currents.

Considering the Five Elements of the trigram that contains it on the Later Heaven compass, the Nhâm mountain lies within the Khảm trigram. The Khảm trigram belongs to the Water element in the Five Elements system assigned to the bagua.

These two statements do not contradict each other because they speak about two different things. The first speaks about the Five Elements of the Heavenly Stem Nhâm. The second speaks about the Five Elements of the Khảm trigram. In the case of the Nhâm mountain, both happen to be Water, so no confusion arises. But with many other mountains, these two statements give two different elements, and that is where misunderstanding easily grows.

For example, the Dần mountain belongs to the Wood element if considered as an Earthly Branch, but lies within the Cấn trigram, which belongs to the Earth element if considered as a trigram. Both are correct, because they answer two different questions. Any article that mixes these two statements without declaring the frame of reference will make readers think one document contradicts another. The correct way to write is always to state clearly: considered by the Five Elements of the stem or branch that names the mountain, the result is A; considered by the Five Elements of the trigram containing it, the result is B.

For the specific Nhâm mountain, both systems give Water, so one can say briefly: the Nhâm mountain belongs to Water under both considerations. But a writer should still declare both systems clearly, so readers know this is a coincidence rather than a general rule.

What is the Tam Nguyên long of the Nhâm mountain, and what does that mean when choosing a mountain-direction?

The Nhâm mountain belongs to the Địa nguyên long (Earthly origin dragon) in the Tam Nguyên long system. This system divides the 24 mountains into three groups: Địa nguyên long, Thiên nguyên long, and Nhân nguyên long, based on the position of the mountain within its trigram and its type.

Within the Khảm trigram, the three mountains are ordered as Earth, Heaven, Human as follows: Nhâm is Địa nguyên long, Tý is Thiên nguyên long, Quý is Nhân nguyên long. The central mountain of the North direction is Tý, and Tý belongs to Thiên nguyên long, in keeping with the rule that the central mountain of a trigram is Thiên nguyên long.

The meaning of Tam Nguyên long lies in the fact that the three mountains within one trigram cannot be substituted for one another when choosing a mountain-direction. Each origin dragon has its own rules for how it combines with direction, with the water mouth, and with other factors in Tam Nguyên feng shui. A house sitting on Nhâm cannot casually be changed to sitting on Tý or sitting on Quý while keeping the same interpretation, because these three mountains belong to three different origin dragons.

More specifically, in Tam Nguyên, when choosing a mountain-direction, one examines which origin dragon the mountain belongs to in order to decide whether a兼 direction (a direction that straddles two mountains) is permitted, and if so, by how many degrees. The Nhâm mountain is Địa nguyên long, so it has its own straddling rule, different from Tý as Thiên nguyên long and Quý as Nhân nguyên long. This is why a shift of just a few degrees on the compass, from Nhâm to Tý, can change the whole interpretation.

It should be said clearly: Tam Nguyên long is a separate frame of reference, and does not replace the Five Elements or the bagua. A mountain can simultaneously belong to the Water element by stem, belong to the Khảm trigram by Later Heaven, and belong to Địa nguyên long by Tam Nguyên. These three pieces of information complement one another, they do not contradict one another.

Where does Bát Trạch place the Nhâm mountain, and what are the limits of that placement?

According to Bát Trạch (the Eight Houses system), the Nhâm mountain belongs to the Khảm trigram, and the Khảm trigram belongs to Đông tứ trạch (the East Four houses). This means that in the Bát Trạch system, a house sitting on the Nhâm mountain is classified in the Đông tứ trạch group, together with the mountains belonging to the Chấn, Tốn and Ly trigrams.

The limit of this placement lies in the fact that Bát Trạch only cares about the trigram of the mountain, and does not distinguish the three mountains within one trigram. In other words, Bát Trạch places Nhâm, Tý and Quý all in Đông tứ trạch, because all three belong to the Khảm trigram. But Tam Nguyên long distinguishes these three mountains as different Địa, Thiên and Nhân origin dragons. This is where the two systems do not conflict, but simply answer two different questions: Bát Trạch asks which trigram the mountain belongs to, Tam Nguyên long asks which origin dragon the mountain belongs to.

Another limit of Bát Trạch is that this system is mainly used to match the house owner's destiny with the house direction, not to interpret in detail down to each 15° mountain. So when we say a house sitting on Nhâm belongs to Đông tứ trạch, we are speaking at the trigram level, not at the mountain level. To interpret at the mountain level, other systems such as Tam Nguyên long or Huyền Không phi tinh (Flying Stars) are needed as well.

It should also be noted: Bát Trạch places the Khảm trigram in Đông tứ trạch, but that does not mean a person of Đông tứ mệnh (East Four destiny) is always compatible with every house sitting on the Nhâm mountain. The Bát Trạch interpretation also depends on each person's specific destiny gua, and on other factors such as the land, the surrounding form, and the time period. Being placed in Đông tứ trạch is only a first step, not a final conclusion.

How does Huyền Không phi tinh use the Nhâm mountain, and where do the schools still disagree?

In Huyền Không phi tinh, the Nhâm mountain is used as one of the 24 mountains for setting up the star chart of a house or a tomb. One determines the sitting mountain and the facing direction, then places the stars according to the period, the mountain and the direction in order to interpret fortune and misfortune. The Nhâm mountain, as a Địa nguyên long belonging to the Khảm trigram, has its own way of placing stars, different from Tý and Quý even though they share the same trigram.

There is at least one point on which the branches of Huyền Không have not agreed: the way of assigning yin and yang to each mountain. Some branches assign yin and yang to the 24 mountains by a fixed rule based on position within the trigram, while some other branches use a different assignment. This disagreement affects how the stars are calculated and how the forward and reverse of the star chart is interpreted. A student of Huyền Không needs to know which branch they are following, because the same Nhâm mountain may be assigned yin or yang differently depending on the branch, and the interpretation will differ.

What needs to be said clearly: this is a real disagreement among Huyền Không branches, not speculation. But this article does not go deep into the details of each branch, because each branch has its own system and needs specialised material to interpret correctly. What matters is that readers know there is disagreement here, so they do not imagine there is only one possible assignment.

In addition, Huyền Không phi tinh also distinguishes mountain and direction by period. The Nhâm mountain in one period may be illuminated by a good star, in another period may meet a bad star. But this is interpretation by time period, not a fixed assertion about wealth or destiny. One should avoid turning Huyền Không into a tool of certain prediction.

Measurement error: the Nhâm mountain is only 15 degrees, a slight shift moves you to another mountain

The Nhâm mountain occupies 337.5° to 352.5°, that is exactly 15° on the compass ring. The two degree marks at its two ends are 337.5° and 352.5°. The adjacent mountain on each side is as follows: toward the Northwest, the preceding mountain is Hợi, occupying 322.5° to 337.5°, belonging to the Càn trigram. Toward the Northeast, the following mountain is Tý, occupying 352.5° to 7.5°, belonging to the Khảm trigram.

Because each mountain is only 15°, measurement error can push the result over to another mountain. If the compass needle reads 337° instead of 337.5°, you have already moved to the Hợi mountain. If the needle reads 353° instead of 352.5°, you have already moved to the Tý mountain. In practice, many factors cause error: surrounding magnetic fields, nearby metal objects, placing the compass off axis, and the error of the compass itself.

This is why measurement needs care, repeated readings, and recording the specific degree number rather than only the mountain name. A house measured at 350° and a house measured at 355° may both be called sitting on Nhâm if the surveyor rounds off, but in fact the second one already lies within the Tý mountain. In Tam Nguyên long, Nhâm is Địa nguyên long while Tý is Thiên nguyên long, so the interpretation will differ.

It should also be noted: the marks 337.5° and 352.5° are theoretical marks on an evenly divided ring. In practice, people often avoid placing a house exactly on the boundary zone between two mountains, because the boundary zone is regarded as a zone of unstable qi. But this is a view held in some schools, not a general rule for every system.

Which parts of this article are cultural knowledge, not prediction?

This entire article is cultural and technical knowledge of the 24 mountain-direction system, not a prediction about wealth, health or destiny. The fact that the Nhâm mountain belongs to the Khảm trigram, belongs to Địa nguyên long, belongs to Đông tứ trạch, or lies at 337.5° to 352.5°, are all conventions within the system, verifiable with a compass and with documents, not prophecies.

Parts such as the Five Elements of Nhâm being Water, of the Khảm trigram being Water, or Nhâm being Yang Water, are all cultural conventions originating from the ten Heavenly Stems and the bagua. They help students understand how the system operates, not to assert what a house sitting on Nhâm will bring.

Parts such as how to interpret by Bát Trạch, Tam Nguyên long, or Huyền Không phi tinh, are ways the feng shui schools organise knowledge and offer assessments. Those assessments are for reference within the framework of the system, not scientific conclusions about the real world. Readers should regard this as a cultural perspective, not a tool for deciding fate.

Overview article on the topic: What is feng shui? Foundational principles and how to apply them