Where is Yap Island in which country?

Yap Island is called Yap in English and Guap in ancient times. Yap Island is one of the Caroline Islands in the western Pacific Ocean and the westernmost state of Micronesia. Yap Island is actually composed of four similar lands, only connected by coral reefs, so it is also called Yap Island. Yap Island is located in the area adjacent to the Pacific plate and the Philippine plate. The island has undulating terrain and dense vegetation. Most of the coast is mangrove swamp surrounded by coral reefs. At the same time, it is also the location of the largest currency in the world. The residents of Yap Island still use stones with a diameter of 4 meters and a weight of 5 tons as money when buying and selling land and houses. These huge stone coins on Yap Island were specially cut from limestone on Palau Island and transported back to Yap Island after crossing the sea. Colonia, the capital of Yapu State, governs 14 coral islands and atolls, extending about 800 kilometers from east to south.