The River Sheppey has its source in a group of springs west of the village of Doulting

Doulting

Doulting is a village and civil parish east of Shepton Mallet, on the A361, in the Mendip district of Somerset, England.-History:The parish of Doulting was part of the Whitstone Hundred....

, near Shepton Mallet

Shepton Mallet

Shepton Mallet is a small rural town and civil parish in the Mendip district of Somerset in South West England. Situated approximately south of Bristol and east of Wells, the town is estimated to have a population of 9,700. It contains the administrative headquarters of Mendip District Council...

 in Somerset

Somerset

The ceremonial and non-metropolitan county of Somerset in South West England borders Bristol and Gloucestershire to the north, Wiltshire to the east, Dorset to the south-east, and Devon to the south-west. It is partly bounded to the north and west by the Bristol Channel and the estuary of the...

, England

England

England is a country that is part of the United Kingdom. It shares land borders with Scotland to the north and Wales to the west; the Irish Sea is to the north west, the Celtic Sea to the south west, with the North Sea to the east and the English Channel to the south separating it from continental...

. It flows through the wetlands to the north of the Polden Hills

Polden Hills

The Polden Hills in Somerset, England are a long, low ridge, extending for , and separated from the Mendip Hills, to which they are nearly parallel, by a marshy tract, known as the Somerset Levels...

 and ultimately joins the River Brue

River Brue

The River Brue originates in the parish of Brewham in Somerset, England, and reaches the sea some 50 km west at Burnham-on-Sea. It originally took a different route from Glastonbury to the sea, but this was changed by the monastery in the twelfth century....

.
From Doulting the Sheppey flows south west to Charlton, where parts of its course have been culverted. The river has been diverted underground for much, though not all, of its passage through Shepton Mallet.