A valley or a basin or a gully, or perhaps a swale or a depression.
hill, saddle, ridge, valley and depression
It was called The Great Depression.
The lines for depression are called hachured lines
The lines for depression are called hachured lines
the football ground is called "le terrain de football / le terrain de foot"
Recession or depression
Cone of depression
Maniac depression is now called bipolar disorder.
Uvala is a closed karst depression, a terrain form usually of elongated structure larger in size than a sinkhole.
because depression is difficult to recognize
Collision
a worldwide economic crisis called the long depression