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River Sem
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Location of the mouth within Wiltshire
Country United Kingdom
Region Wiltshire
Physical characteristics
Main source East Knoyle, Wiltshire, England
51°04′25″N 2°10′04″W / 51.0737°N 2.1678°W / 51.0737; -2.1678
River mouth Wardour, Wiltshire, England
98 m (322 ft)
51°02′45″N 2°06′37″W / 51.045790°N 2.110142°W / 51.045790; -2.110142
Length 7.03 km (4.37 mi)
Basin features
Basin size 25.6 km2 (9.9 sq mi)

The River Sem is a natural waterway that flows through the ceremonial county of Wiltshire in England. It flows approximately 4 14 miles (7 km) from its source near East Knoyle to join the River Nadder near Wardour.


The source is Summerleaze Pond near East Knoyle, just east of the A350. The river flows southeast to Pondhead Copse, below which it flows through two large ponds: Brach Pond and Eeelstage Pond. It then turns east and flows under Savage Bridge and Share Lane before reaching the Nadder, northwest of Wardour.


The river is fed by several small waterways. On its south bank, a stream with a source near Whitebridge Farm southeast of Sedgehill, again close to the A350, flows east to join the Sem near Billhay Farm, above Pondhead Copse.

Also on the south bank, it is fed by a stream that has its source in Bennet's Copse near Hart Hill Stud Farm; this stream flows northeast through Sem Hill and Billhay Pond before joining the Sem at Pondhead Copse.


The underlying geology is that of Kimmeridge Clay overlaying Limestone. Faults between the two layers give rise to the springs that provide the source of the water for the river catchment.

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