In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Sedgemoor like this:
SEDGEMOOR, a marshy tract in the centre of Somerset; 5 miles S E of Bridgewater. It was the scene of the Duke of Monmouth's defeat in 1685; was also the place where a base line of the Trigonometrical survey was measured; and is intersected by dykes, which contributed much to the discomfiture of Monmouth's troops.
A Vision of Britain through Time includes a large library of local statistics for administrative units. For the best overall sense of how the area containing Sedgemoor has changed, please see our redistricted information for the modern district of Sedgemoor. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Sedgemoor and units named after it.
GB Historical GIS / University of Portsmouth, History of Sedgemoor in Somerset | Map and description, A Vision of Britain through Time.
Date accessed: 06th May 2016
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Sedgemoor".