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An islet is a very small island. islette isle. Cay or Key, an islet formed by the accumulation of fine sand deposits atop a reef. Motu, A reef islet formed by broken coral and sand, surrounding an atoll. River island, A small islet within the current of a river. Rock in the sense of a type of islet, is an uninhabited landform composed of rock, lying offshore, and having at most minimal vegetation. Lake stack, a thin, vertical landform jutting out of a body of water. Subsidiary islets, a more technical application is to small land features, isolated by water, lying off the shore of a larger island. Likewise, any emergent land in an atoll is also called an islet. Tidal island, often small islands (not necessarily always islets) which lie off the mainland of an area, being connected to it in low tide and isolated in high tide. 4K UHD 3840×2160.