Appearing like nebulous emeralds adrift over an expanse of a deep blue ocean, Palau is richly endowed with some of the world’s most stunning and unique terrain above and below the sea. Geologically, the islands are pinnacles of an undersea ridge of volcanic mountains, part of the “Pacific Ring of Fire” known for its violent subterranean activity. Its vast lagoon is sheltered by a 105-km-long barrier reef, which extends down the west from Kossol to Peleliu sheltering over 200 mushroom shaped islets—these Rock Islands are significant of Palau’s natural wonder.