A gully or canyon. Since the lines follow a specific elevation above sea level, the closer lines are together the steeper the slope. And a 'V' formation on the lines indicates a narrow deep area surrounded on both sides by higher elevations, or a narrow ridge with dropoffs on both sides could have a similar shape on the map.
NOT REALLY
It indicates a valley!
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The closer the contour lines the steeper the slope.
The lines for depression are called hachured lines
When the contour lines are farther apart, this means that the slopes between them are gentle. On the other side, if the contour interval is smaller, the slope will be steep.
the contour interval
Contour lines.