Karimunjawa is an archipelago of 27 islands in the Java Sea, Indonesia, approximately 80 kilometres northwest of Jepara. The islands' name means 'a stone's throw from Java' in Javanese. They have a total land area of 78 km². The main island is known as Karimun (2,700 ha), while the second largest island is Kemujan (1,400 ha). The islands' population is 6,632 (as of 1997) who inhabit seven of the islands.


Five of these islands are domestically inhabited and together with 22 others from the four major zones; Zone I is the core sanctuary area and is out of bounds to all, Zone 2 is the wilderness area open to limited tourism, Zone 3 is the utilization area, Zone 4 is the buffer zone.
For visitor to the Park, expect a very pleasant welcome by the information staff, and an exciting range of flora and fauna to discover both above and below the water.The reefs harboring 35 types of hard corals, sponges, gorgonian, soft and red corals and an amazing 240 plus variety of fish.