Kalpeni along with two small islets of Tilakkam and Pitti and the uninhabited island of Cheriyam in the north form a single atoll. A peculiar feature of Kalpeni is a huge storm bank of coral debris deposited along its eastern and south-eastern shorelines. It is believed that a violent storm in 1847 threw up huge coral boulders along these shores. It is a socially progressive island and it was here that girls first went to school when women's education was considered taboo. You can swim, snorkel or reef-walk in the vast lagoon and indulge in water sports on kayaks, sailboats and pedal boats.