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The Philippines' main sources of water are rivers, lakes, river basins, and groundwater reservoirs. The longest and largest river, Cagayan River, discharges approximately 53,943 million cubic meters of water annually. Its groundwater reserves are 47,895 million cubic meters replenished by rainfall and seepage from rivers and lakes.
The Philippines is an archipelago that comprises 7,641 islands, [8] and with a total land area of 300,000 square kilometers (115,831 sq mi), it is the world's fifth largest island country. [2][3][9] The eleven largest islands contain 95% of the total land area. The largest of these islands is Luzon at about 105,000 square kilometers (40,541 sq mi).
The Cagayan River, also known as the Río Grande de Cagayán, is the longest river [3][1] and the largest river by discharge volume of water in the Philippines. It has a total length of approximately 505 kilometres (314 mi) and a drainage basin covering 27,753 square kilometres (10,715 sq mi). [2]
Laguna de Bay is a large shallow freshwater body in the heart of Luzon Island with an aggregate area of about 911 km 2 (352 sq mi) and a shoreline of 220 km (140 mi). [8] It is considered to be the third largest inland body of water in Southeast Asia after Tonle Sap in Cambodia and Lake Toba in Sumatra, Indonesia.
Angat Hydropower Corporation. The Angat Watershed Forest Reserve is a conservation area that protects the drainage basin in the southern Sierra Madre range north of Metro Manila in the Philippines where surface water empties into the Angat River and its distributaries. It is spread over an area of 62,309 hectares (153,970 acres) in the eastern ...
27 square kilometers (10 sq mi) The La Mesa Dam and Reservoir is an earth dam in Quezon City, Philippines. Its reservoir can hold up to 50.5 million cubic meters (1,780 million cubic feet), occupying an area of 27 square kilometers (10 sq mi). It is part of the Angat - Ipo -La Mesa water system, which supplies most of the water in Metro Manila.
Taal Lake. 1 Shore length is not a well-defined measure. Taal Lake (Tagalog: Lawa ng Taal, IPA: [taʔal]), formerly known as Bombón Lake, [2][3] is a fresh water caldera lake in the province of Batangas, on the island of Luzon in the Philippines. The lake fills Taal Volcano, a large volcanic caldera formed by very large eruptions between ...
Although water resources have become scarce in some regions and seasons, the Philippines as a whole has more than enough surface and groundwater. However, neglecting to have a coherent environmental policy has led to the contamination of 58% of the groundwater in the Philippines. [31]