Camp Menouthis
A fair-sized, but inexpertly guarded riverside camp in Kanopos Nome. Points of interest include the lone treasue in the center of camp, the captain's quarters in the southwest corner, and the imprisoned civilian by the docks.
Start with the captain's quarters at night. The outside window is completed open and unguarded.
Murderize the two people here, then sneak right across the way, where the treasure is being guarded by two more sleeping people.
Open the red chest to complete the location.
You can also free the civilian by the docks for a not-too-shabby XP bonus.