Stone Crater is another large area, but it's split up into multiple smaller ones. The maps with chest locations are below. At the end of the level, you'll meet Amaysa again and go through another scene. Your path will be blocked by rocks and you'll need to do a rock pushing puzzle to open the way. After that, go North into the last area, Stone Caverns.
Enemies in Stone Crater are: scorpions, armadillos, machete ants and bazooka ants.
Scorpions poison you sometimes when they hit you, unless you have the green ring equipped. You need to use an antidote or wait a while to cure the poison.