Philippine Environment Monitor 2003 | Water Resources, Quality and Availability


Rivers and Lakes occupy 1,830 square kilometers (0.61 percent of total area). The Philippines has 421 principal river basins in 119 proclaimed watersheds. Of these, 19 are considered major river basins and were included in the Water Quantity Scorecard (see Annex 1). The longest river is the Cagayan in Region II. Other important rivers in Luzon include the Agno and Pampanga, crossing the plains of Central Luzon; the Pasig, a commercially important artery flowing through the center of Metro Manila, providing the main drainage outlet for most of the waterways; and the Bicol, the primary river of Region V. The principal river of Mindanao is the Rio Grande de Mindanao, which receives the waters of the Pulangi and the Agusan.

There is no updated inventory of lakes at present, but a recent study has placed the number of lakes at 72. 1 The largest lake is the Laguna de Bay, which encompasses two regions: Metro Manila and Region IV with an area of 922 km 2 (Box 1).

Lake Taal, 56 km south of Manila, occupies a huge volcanic crater and contains an island that is itself a volcano, with its own crater lake. The largest lake in Mindanao is Lake Lanao, which is a major source of hydropower.

Source InstitutionWorld Bank
Source URL
Page Count6
Place of PublicationPasig City
Original Publication Date