The Hills of Tarnost were a series of hills lying in the Belfalas region of Gondor, between the river Gilrain to the east and Dol Amroth to the west. To the north was the river Ringló. There may have been a town named Tarnost in the same area.
This range of hills spanned over one-hundred miles from north to south, and about thirty-five to fifty miles from east to west.
- The Atlas of Middle-earth pg. 89