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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. [2]
Two other rivers, the Meycauayan River and Polo River that drains Malabon and Valenzuela dump their water here. Another great rivers, the Santa Maria River and Balagtas River meet up with the Marilao River in the Obando area before reaching Manila Bay. Meycauayan River: Major channel. Drains water from Valenzuela and Meycauayan in Bulacan.
The Mangangate River (Tagalog: Ilog Mangangate), also referred to as the Alabang–Cupang River, is a river system in Muntinlupa, Philippines. It is one of 21 major tributaries of Laguna de Bay . The main stream has a total length of 10 kilometers (6.2 mi) and has two branches.
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 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 Angat River joins the Pampanga River at Calumpit, Bulacan via the Bagbag River. Mount Arayat stands in the middle of the basin. Southeast of Mount Arayat and the Pampanga River is the Candaba Swamp , covering an area of some 250 square kilometres (97 sq mi) absorbing most of the flood flows from the western slopes of a portion of the Sierra ...
The Bicol River is the eighth largest river in the Philippines in terms of drainage basin size with an estimated catchment area of 3,770 square kilometres (1,460 sq mi). The river drains a large part of Bicol Peninsula of the southeastern part of the island of Luzon and passes through Camarines Sur province.
The Siniloan River (Tagalog: Ilog ng Siniloan), also known as the Romelo River, is a river system that runs through Siniloan, Laguna on the island of Luzon, in the Philippines. It is one of 21 tributaries of Laguna de Bay and is regularly monitored by the Laguna Lake Development Authority (LLDA) through one of its 15 river monitoring stations.