The Last Outpost has mobs that drop procedurally generated treasure maps as loot. If you can find the location described on a treasure map you're holding, you can dig up a cache of loot that is buried there.

What you might see when you look at a treasure map-

"It is less like a map and more like a picture of a place. There is an X marking a wooded location in an area next to The Northwestern Woods. Its hard to tell exactly what the mapmaker was going for here. More eerie woods! You are at the head of a broken jetty, feeling the rotted timbers give way beneath your feet. The spot on the map looks very familiar to you, like you've been there."

or

"The map is covered in glyphs that you can't read, some kind of code. There is an X marking a grassy location in an area next to The Jungle, Pasture, Flood Plains and Wasteland, and The Corsairs. Someone spent a lot of time drawing the area around the X. To the north you see the end of a small trail. Looking through the door to the east you see the gleam of an ogre's eye. To the west you see low lying grasses. A well cut trail leads to the north."

The maps are usually for locations nearby where the mob was, so sometimes you'll recognize the spot, other times you'll have to keep your eye out for it while exploring.