republic in Oceania
Yap is one of the four states of the Federated States of Micronesia.
Visas are not required for tourists staying 30 days or fewer. Travelers must have a valid passport and/or documentation of citizenship. All visitors to Yap must have an onward or return ticket. Entry authorization for stays greater than 30 days must be obtained in advance from Immigration and Labor, FSM National Government, Kolonia, Pohnpei, FSM 96941.
More information available on Wikivoyage