Jakarta Capital City is grouped into five city administrative areas and one district administrative area: the administrative city of Central Jakarta with an area of 47.9 sq km, North Jakarta (142.2 sq km), West Jakarta (126.15 sq km), South Jakarta (145.73 sq km), East Jakarta (187.73 sq km), and the Thousand Islands administrative district (11.81 sq km). To the north extends a 35 km coastline into which thirteen rivers and two canals discharge. To the south and east are Depok City, Bogor District, Bekasi City, and Bekasi District; to the west Tangerang City and Tangerang District; and to the north the Java Sea.

Geologically, the entire mainland consists of Pleistocene sediments found around fifty meters underground. The southern part consists of an alluvial layer with lower lying coastal land stretching inland for around 10 km. Underneath there’s an older layer which is not visible from the surface as it is entirely covered by an alluvium layer. In the northern section this layer can be found only at 10 m to 25 m deep, but as you move further to the south this hard surface can be found as shallow as 8 m to 15 m underground. Certain parts feature hard soil surfaces as deep as 40 m.

Overall, Jakarta is subject to a hot climate with maximum air temperatures ranging between 32.7°C and 34°C during day, and 23.8°C and 25.4°C at night. Between 2002 and 2006, rainfall averaged 237.96 mm with the lowest quantity being 122.0 mm in 2002 and the highest 267.4 mm in 2005; humidity varied between 73.0 per cent and 78.0 per cent, wind speed between 2.2 m/s and 2.5 m/s.

Source: Bylaw No. 1 of 2009 concerning the Provincial Medium-term Development Plan for 2007-2012