deep ravine; glen
A deep, narrow valley with steep sides, often with a poetic or literary feel. 'Glen' is a less common English equivalent.
A deep ravine stretches deep in the mountains.
deep mountain valleys
Composed of 幽 (secluded, deep) and 谷 (valley). The exact historical derivation is uncertain; the spelling is conventionally associated with the meaning of a deep, quiet ravine.