This chapter begins as Drake walks through the desert alone without water…bad place to be in. Head for the wreckage of the plane for a scene and then keep walking along the dune until the screen fades. When the screen returns you’ll be only a few feet from a well that when approached will trigger a scene. While the well is empty, the vase on the other side of the well has the Calcite Statue of Female Figure treasure waiting for you inside.
When it finally reaches night you’ll need to use the hint to continue into the next day, which will have you come across a mirage that fades into the same well from earlier. If you didn’t get the treasure before you should do it quickly now. You’ll now nee dto wander aimlessly for a while until you finally reach the settlement to complete the chapter.