The River Frome's length is: 30 miles or 48.28 km.
The river Thames rises in Gloucestershire and flows through Oxford, Reading, Windsor and London before discharging into the North Sea. It is 212 miles long.
The River Thames is 346 km (215 miles) long. It rises (source) at Thames Head near Kemble in Gloucestershire and winds its way through several counties in Southern England eastwards to the North Sea at its mouth in the Thames estuary between Kent and Essex. The Thames is the longest river entirely in England. 212 miles
The river Thames is 215 miles long, the longest is the river Severn at 220 miles long.
The Orinoco River is 1,330 miles long
The Missouri River is 2,341 miles long and is the longest tributary to the Mississippi River.
The Hudson river is about 315 miles long
The Mississippi River is 2,302.18 miles long.
The river Nile is 4135 miles long, the Amazon is 3980 miles long
990 miles long
It is 4,160 miles long and is the longest river in the world.
The river is about 3,915 miles or 6,300 km long.
The Missouri River is 2,341 miles long and is the longest tributary to the Mississippi River.