Colorado River

Colorado River is main river of the  southwestern United States and northwest Mexico. 
Countries- United States, Mexico
Length- 1,450 mi (2,334 km)

Futaleufu River

The FutaleufĂș River is a river fed by the lakes in the Los Alerces National Park in Chubut Province, Argentina.(Source)

Snake River

Snake River is main river of the greater Pacific Northwest in the United States.(source)
Country- United States
Region- Pacific Northwest
Source- Rocky Mountains
Length- 1,078 mi (1,735 km)

River Thames

River Thames is most beautiful river.It  flows through southern England.This is Longest river in England so also it is second longest in the United Kingdom.(Source)
Country- England
Source- Thames Head, Gloucestershire, UK
Length- 346 km (215 mi)

Rainbow River

Rainbow River Most attractive river in Dunnellon, Florida, USA.This river is 5.7 miles (9.2 km) long and merges with the Withlacoochee River at Dunnellon, Florida. (source)

Little Pigeon River

Little Pigeon River is a located Sevier County, Tennessee.(Source)

East River

East River is a flow in New York City. It connects Upper New York Bay.(source)
Country- United States
State- New York
Source- Long Island Sound
Length- 16 mi (26 km)

Rio Negro 

Rio Negro also known as Black river in  Amazon.It is the largest blackwater river in the world.
Countries- Colombia, Venezuela, Brazil.(source)
Length- 2,230 km (1,390 mi)
Basin- 691,000 km2

Zambezi  River

Zambezi is beautiful river in Africa and it is the largest flowing into the Indian Ocean from Africa.(source) 
Source- Mwinilunga, Zambia
Length- 2,574 km (1,599 mi)

Congo River

Congo River also known as the Zaire River.That is located in  Africa.Congo River is  the deepest river in the world.It has 220 m (720 ft) depth and Length 4,700 km (2,920 mi).(source)

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