From the hills and mountains of Bogor Regency, the Ciliwung River flows downstream, stretching 118.25 kilometers to the Java Sea. It crosses the region of Bogor Regency, the cities of Bogor, Depok, and Jakarta, and drains into the Java Sea through Jakarta Bay in Indonesia. With a total area of 421.47 square kilometers, the Ciliwung River Basin plays a key role in supporting livelihood, agricultural activities, trade, transportation and local tourism in the three major cities of Bogor, Depok, and Jakarta. The Ciliwung Dam in the upstream Bogor, which was built in 1911, provides irrigation to 333 hectares of rice lands. Known also for its fertile lands for world-class tea plantations, Bogor Regency has greatly benefited from the nutrients and water services of the river basin.