What is "upslopes"

Usage examples of "upslopes".

The ridge showed as a red snake, pink downslopes on either side, a green line for the River Shabbulus beyond those and further pink upslopes after that.

There was a great hollow of darkness fronting him, and on the black upslopes patches of tiny lights, and in the lowest trough of the night, a flare of the pit.

I easy-footed it after them, with plenty of wheezing on the upslopes and some realistic panting at the breaks, enough to make me look busy, but not enough to give the giant ideas of slowing down.