A delta is an area of low, flat land shaped like a triangle, where a river splits and spreads out into several branches before entering the sea. ...the Mississippi delta.
A valley is a low stretch of land between hills, especially one that has a river flowing through it. ...a wooded valley set against the backdrop of Monte Rosa. A valley shaped like a U.
A valley is a low stretch of land between hills, especially one that has a river flowing through it. ...a wooded valley set against the backdrop of Monte Rosa. A valley shaped like a V.