The low ground between two hills is called a valley.
Valley
Valley
River
the low ground between two hills is a VALLEY.
valley
The ground between two hills is called a valley. A very small one can be called a gully.
A saddle is one form.
Valley. A valley is usually found between two ranges of hills rather than between two hills. The small "valley" between two hills is more properly called a "coll".
A valley/saddle/coll
A valley is the low area between two mountains or hills.
Mountains / hills ; (River) divides.
A low spot between two hills. Make a fist, with your knuckles up. The knuckles are the hills- the low areas inbetween would be saddles.
Valley!
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A passage through a hill ; underground, is called a TUNNEL. However, a passage between two hills (surface) is a VALLEY. A passage between two hills is dependent on its width. If the hills are low and far apart, then it is a VALE. However, if the hills are high and close together then it is a GLEN or RAVINE, or GORGE.