Piagailoe Atoll is an uninhabited atoll in the State of Yap in the Federated States of Micronesia, geographically part of the Caroline Islands. It is located 71 kilometers northeast of Lamotrek, 71 kilometers northwest of Satawal and 945 kilometers southeast of Yap island.This atoll lies at the western end of a chain of submarine mountains that extend westwards of the Gray Feather Bank for about 180 km. The Condor Reef, Pikelot and the Oraitilipu Bank belong to this underwater feature as well. In order to distinguish this atoll from Fayu (East Fayu) Atoll in Chuuk State, located about 500 km to the east, this atoll is also known as West Fayu.