The catchment area of the river is approximately 414 square kilometres (160 sq mi) and the average daily flow for the entire catchment is estimated to be 4.76 cubic metres per second (168 cu ft/s).
Water from tributaries such as Hillfarrance Brook, Halse Water, Haywards Water, Three Bridges Stream, Sherford Stream and Broughton Brook feed the river but are supplemented by controlled releases from Clatworthy and Luxhay Reservoirs during dry periods.
The tributaries flowing into the Tone from the south bring water from the Blackdown Hills.

The rivers source is in the Brendon Hills which fall within the Exmoor National Park.
The hills are quite heavily cultivated unlike their neighbouring upland areas of Exmoor and the Quantock Hills.
The Brendon Hills are largely formed from the Morte Slates, a thick faulted and folded sequence of Devonian age sedimentary rocks.
It then flows through an alluvial floodplain underlain by sub-alluvial gravels, underlain by rocks of the Mercia Mudstone Group.
The floodplain is between 5 metres (16 ft) and 50 metres (160 ft)  above the ordnance datum (mean sea level).
The surrounding land is dominated by wet meadow and wooded areas including willow trees.

Water quality in the river can be affected by dredging work.
The catchment area of the river is approximately 414 square kilometres (160 sq mi) and the average daily flow for the entire catchment is estimated to be 4.76 cubic metres per second (168 cu ft/s). Water from tributaries such as Hillfarrance Brook, Halse Water, Haywards Water, Three Bridges Stream, Sherford Stream and Broughton Brook feed the river but are supplemented by controlled releases from Clatworthy and Luxhay Reservoirs during dry periods. The tributaries flowing into the Tone from the south bring water from the Blackdown Hills.
The rivers source is in the Brendon Hills which fall within the Exmoor National Park. The hills are quite heavily cultivated unlike their neighbouring upland areas of Exmoor and the Quantock Hills. The Brendon Hills are largely formed from the Morte Slates, a thick faulted and folded sequence of Devonian age sedimentary rocks. It then flows through an alluvial floodplain underlain by sub-alluvial gravels, underlain by rocks of the Mercia Mudstone Group. The floodplain is between 5 metres (16 ft) and 50 metres (160 ft)  above the ordnance datum (mean sea level). The surrounding land is dominated by wet meadow and wooded areas including willow trees.
Water quality in the river can be affected by dredging work.
River Tone