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18 Major River Basins in the Philippines Rivers in the Philippines are grouped into 18 major river basins . Of these, the Cagayan , the country's longest river, [ 1 ] has the largest drainage basin, followed by the Mindanao , the Agusan , and the Pampanga .
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 Rio Grande de Mindanao, also known as the Mindanao River, is the second-largest river system in the Philippines.Located on the southern island of Mindanao, with a total drainage area of 23,169 km 2 (8,946 sq mi), [2] draining the majority of the central and eastern portion of the island, and a total length of approximately 373 km (232 mi).
The Abra River, also called Lagben River, is the seventh largest river system in the Philippines in terms of watershed size. It has an estimated drainage area of 5,125 square kilometres (1,979 sq mi) and a length of 179 kilometres (111 mi) from its source near Mount Data in Benguet province.
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 ]
The reserve is one of six protected areas located in the 623,318.69-hectare (1,540,254.0-acre) Agno River Basin, the third largest river system in Luzon and the Philippines' fifth largest. [14] [16] It is a sub-catchment of the Agno River which drains into Lingayen Gulf from its headwaters at Mount Data further north.
This stream operating together with its environment can be thought of as forming a river ecosystem. River ecosystems are flowing waters that drain the landscape, and include the biotic (living) interactions amongst plants, animals and micro-organisms, as well as abiotic (nonliving) physical and chemical interactions of its many parts.
The Cagayan River, also known as the Cagayan de Oro River, is one of the rivers draining the northern central part of the island of Mindanao in the Philippines.The river has its headwaters in the Kalatungan Mountain Range and Kitanglad Mountain Range found in the central part of the province of Bukidnon.