Mamoré River

It rises on the northern slope of the Sierra de Cochabamba, east of the city of Cochabamba, and is known as the Chimoré down to its junction with the Chapare. Its larger tributaries are the Chapare, Secure, Apere, and Yacuma from the west, and the Ichilo, Guapay, Ivari, Manique and Guapore from the east. Taking into account its length only, the Guapay should be considered the upper part of the Mamore; but it is shallow and obstructed, and carries a much smaller volume of water. The Guapore also rivals the Mamore in length and volume, having its source in the Parecis plateau, Mato Grosso, Brazil, a few miles from streams flowing north-ward to the Tapajos and Amazon, and southward to the Paraguay and Paraná rivers. The Mamore is interrupted by rapids a few miles above its junction with the Beni, but a railway 300 km long has been undertaken from below the rapids of the Madeira. Above the rapids the river is navigable to Chimore, at the foot of the sierra, and most of its tributaries are navigable for long distances. In 1874, Franz Keller gave the outflow of the Mamoré at mean water level, and not including the Guapore, as 41,459 cm³/sec (2,530 cub. in. per second), and the area of its drainage basin, also not including the Guapore, as 24,299 km² (9,382 square miles).

Mamoré River
Confluence of the Ivirgarzama River and the Ichilo River, and of the Chimoré River and the Ichilo River to the Mamoré River (north is to the upper right corner of this ISS image)
Map of the Amazon Basin with the Mamoré River highlighted
Location
Country	Brazil, Bolivia
Physical characteristics
Source	Sierra de Cochabamba
• location	Pojo, Bolivia
• coordinates	17°37′59″S 64°56′02″W / 17.633°S 64.934°W / -17.633; -64.934
• elevation	3,372 m (11,063 ft)
Mouth	Madeira River
• location	near Vila Murtinho, Brazil/Bolivia border
• coordinates	10°22′59″S 65°23′35″W / 10.383°S 65.393°W / -10.383; -65.393
• elevation	110 m (360 ft)
Length	1,930 km (1,200 mi)
Basin size	637,401.1 km2 (246,101.9 sq mi)
Discharge
• location	Near mouth
• average	(Period: 1985–2013)8,150 m3/s (288,000 cu ft/s) (Period: 1971–2000)8,857.3 m3/s (312,790 cu ft/s)
Discharge
• location	Guayaramerín (Basin size: 611,800 km2 (236,200 sq mi)
• average	(Period: 1985–2013)7,650 m3/s (270,000 cu ft/s) (Period: 1971–2000)8,414.5 m3/s (297,160 cu ft/s)
• minimum	(Period: 1985–2013)1,660 m3/s (59,000 cu ft/s)
• maximum	(Period: 1985–2013)15,200 m3/s (540,000 cu ft/s)
Discharge
• location	Puerto Siles (Basin size: 229,300 km2 (88,500 sq mi)
• average	(Period: 1985–2013)4,600 m3/s (160,000 cu ft/s)
• minimum	(Period: 1985–2013)1,180 m3/s (42,000 cu ft/s)
• maximum	(Period: 1985–2013)8,850 m3/s (313,000 cu ft/s)
Discharge
• location	Camiaco (Basin size: 128,800 km2 (49,700 sq mi)
• average	(Period: 1985–2013)2,180 m3/s (77,000 cu ft/s)
• minimum	(Period: 1985–2013)750 m3/s (26,000 cu ft/s)
• maximum	(Period: 1985–2013)3,900 m3/s (140,000 cu ft/s)
Basin features
Progression	Madeira → Amazon → Atlantic Ocean
River system	Amazon
Tributaries
• left	Chapare, Isiboro, Apere, Yacuma, San Miguel, Yata
• right	Rio Grande, Ibare, Guaporé, Pacaás Novo

An extensive pre-Columbian civilization existed in the basin of the Mamore in the swampy area known as the Llanos de Moxos, in northeastern Bolivia.

• Mamoré–Guaporé linguistic area