Chetumal Bay is a semi-closed mesohaline estuary on the southern coast of the Yucatán Peninsula.[1] The mouth of Chetumal Bay is directed southward and buffered by the large Belizean island of Ambergris Caye.Chetumal is a major city on the bay, located in the Mexican state of Quintana Roo.With a depth of at least 420 metres (1,380 ft), it is the world deepest known blue hole.You can help Wikipedia by expanding it.This article about a location in the Mexican state of Quintana Roo is a stub.