TheVanikolo Islands (Vanikoro Islands)(11°40'S., 166°54'E.) are composed of two islands of volcanic origin, Vanikolo Island and Tevai Island. Mount Popogia, 924m high, rises almost in the center of Vanikolo Island and streams of lava are still perceptible. The barrier reef encircling these islands in some places lies up to 2.5 miles from the shore. A short reef also encircles nearly every part of the coast of each of these islands. Between the barrier reef and the shore reef, the depths vary from 18.3 to 82m, but there are numerous coral rocks which render the inner navigation very dangerous.

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