What is "aguigan"

Aguigan (also known as Aguihan, based on the Spanish rendition of the native name, "Aguijan", which is still often used as well) is a small bean-shaped coralline island in the Northern Mariana Islands chain in the Pacific Ocean. It is situated southwest of Tinian, from which it is separated by the Tinian Channel. Aguigan and neighboring Tinian Island together form Tinian Municipality, one of the four main political divisions that comprise the Northern Marianas.