[ noun ] a sloping mass of loose rocks at the base of a cliff <noun.object>
Scree \Scree\ (skr[=e]), n. A pebble; a stone; also, a heap of stones or rocky d['e]bris. [Prov. Eng.] --Southey.
I found it quite by chance when I wandered away from our camp site and scrambled over scree while trying to follow the trails of nimble goats. Once away from the tents, the sense of isolation was complete.