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Rio Grande de Mindanao
Mindanao River
Tamontaka River
Cotabato River
Rio Grande de Mindanao; Mindanao River; Tamontaka River; Cotabato River;
	Drainage map of Mindanao River
	Mindanao River mouth Rio Grande de Mindanao (Philippines)
Location
Country	Philippines
Region	Northern Mindanao; Soccsksargen; BARMM;
Province	Bukidnon; Maguindanao del Norte; Maguindanao del Sur; Cotabato;
Cities	Malaybalay; Valencia; Kidapawan; Koronadal; Cotabato City;
Physical characteristics
Source	Kitanglad Mountain Range
• location	Brgy. Kalabugao, Impasugong, Bukidnon
• coordinates	8°27′15″N 125°09′46″E / 8.45417°N 125.16278°E
Mouth	Illana Bay
• location	Cotabato City
• coordinates	7°15′20″N 124°12′0″E / 7.25556°N 124.20000°E
• elevation	0 m (0 ft)
Length	373 km (232 mi)
Basin size	23,169 km2 (8,946 sq mi)
Discharge
• average	1,400 m3/s (49,000 cu ft/s)
• maximum	3,000 m3/s (110,000 cu ft/s)
Basin features
Tributaries
• left	Allah River; Buluan River; Kabulnan River;
• right	Pulangi River; M'lang River; Simuay River;

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 km² (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).^[1]^[3] It is an important transportation artery, used mainly in transporting agricultural products and, formerly, timber.

Its headwaters are in the mountains of Impasugong, Bukidnon, south of Gingoog in Misamis Oriental, where it is called the Pulangi River. Joining the Kabacan River, it becomes the Mindanao River. Flowing out of the mountains, it forms the center of a broad, fertile plain in the southcentral portion of the island. Before its mouth in Illana Bay, it splits into two parallel sections, the Cotabato and Tamontaka, separated by a 180 m (590 ft) hill.

Population centers along the river include Cotabato City, Datu Piang and Midsayap.

Course

The Rio Grande de Mindanao has its source in the Central Mindanao Highlands near the northern coast of the island, specifically on the northeastern part of the province of Bukidnon, where it is known as the Pulangi River. It then flows southward across the Bukidnon Plateau, fed up by its tributaries along the way and then emerges onto the Cotabato plains, depositing fertile mountain silt as it widens and arcs westward through the Cotabato River Basin. It finally empties into Illana Bay at its mouth at Cotabato City.

As the Mindanao River meets Illana Bay, it branches out into two distributaries, the Cotabato in the north and the Tamontaka in the south at Cotabato City.

Tributaries

Rio Grande de Mindanao River List of tributaries by length.

Pulangi River 374 km (232 mi)
Kabulnan River 175 km (109 mi)
Allah River 130 km (81 mi)
Buluan River 109 km (68 mi)
Simuay River 81 km (50 mi)
Libungan River 80 km (50 mi)
M'lang River 62 km (39 mi)

Water hyacinths

The river has recently been clogged with water hyacinths, causing it to overflow after days of heavy rain. Floodwaters submerged at least 37 villages in Cotabato City alone and displaced some 6,000 families.

President Benigno Aquino III ordered public works and military personnel to clear the river of up to 20 hectares (0.20 km²) of water lily growth.^[4]

References

^ ^a ^b Kenneth Kimutai too (July 24, 2018). "Longest Rivers In The Philippines". worldatlas.com. WorldAtlas. Retrieved September 6, 2019.
^ ^a ^b Vicente B. Tuddao Jr. (September 21, 2011). "Water Quality Management in the Context of Basin Management: Water Quality, River Basin Management and Governance Dynamics in the Philippines" (PDF). www.wepa-db.net. Department of Environment and Natural Resources. Retrieved April 5, 2017.
^ Principal River Basins of the Philippines, published by the National Water Resources Board, October 1976 (p. 12)
^ "Aquino leads 'war vs water hyacinths'". Philippine Daily Inquirer. June 23, 2011. Retrieved June 22, 2011.