Bicol River

Bicol River
The Bicol River at Calabanga
Bicol River drainage area
Bicol River mouth Show map of Luzon Bicol River (Philippines) Show map of Philippines
Native name	Salog Bikol (Central Bikol)
Location
Country	Philippines
Region	Bicol Region
Province	Camarines Sur
Cities	Naga Iriga
Physical characteristics
Source	Lake Bato
• location	Bato, Camarines Sur and Libon, Albay, Bicol Region
• coordinates	13°19′55″N 123°21′32″E / 13.33194°N 123.35889°E / 13.33194; 123.35889
• elevation	6 m (20 ft)
Mouth
• location	Between Cabusao and Calabanga, Camarines Sur, Bicol Region
• coordinates	13°43′00″N 123°06′25″E / 13.71667°N 123.10694°E / 13.71667; 123.10694
• elevation	0 m (0 ft)
Length	94 km (58 mi)
Basin size	3,770 km2 (1,460 sq mi)
Discharge
• location	San Miguel Bay (when the sea level is low)
• average	165 m3/s (5,800 cu ft/s)
• minimum	123 m3/s (4,300 cu ft/s)
• maximum	205 m3/s (7,200 cu ft/s)
Basin features
Tributaries
• left	Libmanan River Sipocot River
• right	Naga River Yabu River

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 southwestern Bicol Peninsula of the island of Luzon and passes through Camarines Sur province.^[1]

The river starts from Lake Bato,^[1][2] 6 metres (20 ft) above sea level, and flows 94 kilometres (58 mi) downstream to its estuarine mouth at San Miguel Bay. It passes through Naga City, the alluvial and coastal plains of the vast Bicol Valley, an elongated, northwesterly trending depression in the Bicol Region, which contains alluvial plains to the coastal plain. Average slope within the river's drainage basin is 0.006%.

The basin has an influence area of 10,058 square kilometres (3,883 sq mi) including its drainage basin. It lies between 13°0 to 14°N and 123°0 and 124°0 E. It is extensively a coastal flood plain.^[2]