Halmahera Sea is a regional sea located in the central eastern part of the Australasian Mediterranean Sea. It is centered at about 1°S and 129°E and is bordered by the Pacific Ocean to the north, Halmahera to the west, Waigeo and Irian Jaya to the east, and the Seram Sea to the south. It covers about 95,000 km and its topography comprises a number of separate basins and ridges, the chief of which is the Halmahera Basin reaching a depth of 2039 m.