Battlefield of Kadesh (Heb Sed)
The central location in Heb Sed, part of several sidequests, and site of your eventual showdown with Ramsses.
There are three treasures here- two are scattered on the battlefield (at the north and south edges), and one is in the small camp behind (ie to the west of) Ramsses' throne.
Scoop up the battlefield ones (there's no resistance here, barring the occasional sandstorm), then make for the camp. It's guarded by hyenas, who can be dispatched in the usual manner.
Loot the central tent to complete the location.