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Ridge
A sloping line of high ground that, in the center, has low ground in three directions and high ground in one. Contour lines form a U or V shape with the closed ends pointing away from high ground.
Saddle
A saddle is a dip or low point between two areas of high ground. Not necessarily the lower ground, just a dip or break. Represented as an hourglass or figure 8 shape in contour lines.
Depression
A depression is a low point or hole in the ground. It appears on a map as a circle with tick marks pointing towards lower ground.
Draw
A draw is a less developed stream course than a valley. There is no level ground in a draw. On a map a draw is represented with U or V shapes pointing toward high ground