River Basins in Java Island The island of Java covers an area of about 132,590 km2, where roughly 60 percent of the island is cultivated for agricultural purposes, of which about 45 percent benefits from some form of irrigation. It has been decided to divide island of Java up into 23 river basin subdivisions, where for each river basin three main topics are going to be considered: Survey of water resources; present day water consumption; and future water consumption 2005 – 2025. River basin system / Area (km2) 1. Banten / 6.930 km2 1.1 Teluk lada / 3.760 km2 1.2. Banten / 3.170 km2 2. C.J.C / ...