The mushroom shaped Rock Islands of Palau were formed from limestone reefs pushed upwards, in ancient times, by underlying volcanic activity. Over the millenniums, rainwater, percolating down through the limestone, eroded the interior of the islands, forming in some cases, vast cave systems. Chandelier Cave was an open-air cave, but today it is a water-filled cave containing stalactites and stalagmites that resemble glittering chandeliers. The cave is comprised of five chambers, four are water filled chambers (each with an air pocket) and the fifth is completely above water. Chandelier Cave is a dive site not to be missed. During WWII there were fierce battles for control of Palau’s heavily fortified Islands and as a result there are a few wrecks accessible to divers. One of the best is the Japanese Aichi E13 ‘Jake’ reconnaissance seaplane. The excellent visibility on the wreck makes for great photography. Palau’s Jellyfish Lake is located within the Rock Islands and the trail to the lake provides an enjoyable introduction to the flora and fauna of the Palau jungle. Golden Jellyfish are found in great abundance (5 million plus individuals) throughout the lake, often accumulating in spectacular aggregations along the edges of shadows cast by the mangrove trees that line the lake’s shore.