/ˈvæli/
NOUN
A long, relatively low area of land between hills or mountains, often with a river or stream flowing through it.
A naturally low area of land surrounded by higher terrain, such as hills, mountains, or elevated slopes.
An area of land from which water drains toward a particular river or river system.
NOUN
A recessed or V-shaped area formed by the meeting of two sloping surfaces, especially two sections of a roof.
The internal angle or channel created where two sloping roof planes meet, forming a valley-like depression.