Hathor of Mefkat
A ruined temple in Khensu Nome.
Scanning reveals the treasure is well-underground, but you'll still have to sneak or kill your way through the ruins to access it.
Whether you go stealth or stabby, the high pillars and arches here give you an easy advantage over the scattered hostiles.
The door into the temple is near the middle of the ruins, facing south.
The passages here are full of snakes- spears are ideal for taking them out safely.
The treasure is in the northwest corner of the complex. Loot it to complete the location.
Note that you can fast travel immediately out of here- you don't need to return to the surface.