mountain recesses
嵎 centers on a secluded, recessed area within mountains: a hidden nook or deep fold in the terrain.
嵎 combines 山 (mountain) with 禺, which likely contributes the sound and may relate to a secluded or corner-like idea, giving the sense of a mountain recess.
The mountain 山 on the left and the shape 禺 on the right suggest a hidden corner tucked into the mountainside: a deep mountain recess.
For グウ, imagine a gooey, secluded cave deep in the mountain recesses: gooey -> グウ, and the sticky goo fills the hidden nook.