Java Sea is shallow waters with an area of approximately 310,000 km2 between the islands of Borneo, Java, Sumatra, and Sulawesi in the archipelago of Indonesia. The sea is relatively young, formed in the last Ice Age (about 12,000 BC) when two river systems unite. To the northwest, the Karimata Strait connects it to the South China Sea
In the Java Sea there are several clusters of islands and islands: Kepulauan Seribu in the north of Tangerang Regency and administratively included in the territory of DKI Jakarta, Karimun Jawa Island which belongs to the administration of Central Java, Bawean Island and the surrounding small islands, Masalembo and Kangean islands along with the surrounding small islands which are under the administration of East Java Province.
Fishery is an important economic activity in the Java Sea. There are 3000 more species of marine life in this area. The Java Sea, especially in the west, has oil and natural gas reserves that can be exploited.
The area around the Java Sea is a popular tourist destination. Scuba diving offers the opportunity to explore and photograph underwater caves, sunken ships, coral reefs, and underwater life. Some national parks are in this area. Near Jakarta, in the Thousand Islands is Ujung Kulon National Park. Karimun Jawa is a national park consisting of twenty-seven islands. Menjagan Island, near Bali, is a "secluded" national park.