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Accessible by foot or by renting a canoe, or be lazy and charter a longtail. Be careful as the monkeys can sometimes be aggressive. Some tourists report attacks and local hospitals caution about rabies. (You should not feed wildlife).
Pi Ley is a large inlet on Koh Phi Phi Ley in-between Phaya Naak Cave and Loh Samah. The whole inlet is surrounded by vertical cliffs. The sea is shallow near the mouth and the depths of the inlet are reached by going over the coral reef at its entrance. At the back of the inlet is a large 100m wide pool that is about 5-8 m deep.