The island of Pohnpei is the largest and tallest in the Federated States of Micronesia (FSM). An abundance of rain falls on its rugged mountain peaks, streaming into more than 40 rivers that feed the upper rain forest. Its waterfalls range from pleasant to spectacular, some with large swimming ponds. Although mangrove swamps surround most of Pohnpei’s coastline, nearby reef islands boast beautiful sandy beaches.