Nature Grotto is a small cave located deep within the Mort Myre Swamp. It is located north-west of the village of Mor'ton and directly east of the Exam Centre, though of course across the river. You may pray at the altar in the cave, earning you 2 extra Prayer points until spending them. The Nature Grotto first appears in the quest Nature Spirit, of which it is a vital part of the quest. Filliman Tarlock resides here.