Pohnpei is an island of the Senyavin Islands which are part of the larger Caroline Islands group. It belongs to Pohnpei State, one of the four states in the Federated States of Micronesia (FSM). Major population centers on Pohnpei include Palikir, the FSM's capital, and Kolonia, the capital of Pohnpei State. Pohnpei is the largest island in the FSM, with an area of 334 km2 (129 sq mi), and a highest point of 782 m (2,566 ft), the most populous with 36,832 people, and the most developed single island in the FSM.

The Senyavin Islands belong to Pohnpei State in the Federated States of Micronesia. They consist of a larger volcanic Pohnpei Island and two small atolls Ant and Pakin.