This is the Shady sand garden section of the map of the wasteland presented by:
Go here after you are done with the town hall part of shady sands. First check the top-most building and you will find a rope and survival guide in the book case. The rope is so you don't have to buy/steal one from Seth. also there is a hidden sledge-hammer in the lowest building. If you have a science skill of 40% or more talk to the gardener Curtis i for some quick Exp.