Kai Besar (Great Kai Island, also Nuhu Yuut or Nusteen) is one of the Kai Islands which are part of the Maluku Islands, Indonesia. Its area is 550 km². The other main island in the Kai Islands group is Kai Kecil (Little Kai Island). The northern tip is called Tanjung Borang, and southern tip called Tanjung Weduar.