The Witham Navigable Drains are located in Lincolnshire, England, and are part of a much larger drainage system managed by the Witham Fourth District Internal Drainage Board. The Witham Fourth District comprises the East Fen and West Fen, to the north of Boston, which together cover an area of 97 square miles (250 km2). In total there are over 438 miles (705 km) of drainage ditches, of which under 60 miles (97 km) are navigable. Navigation is normally only possible in the summer months, as the drains are maintained at a lower level in winter, and are subject to sudden changes in level as a result of their primary drainage function, which can leave boats stranded. Access to the drains is from the River Witham at Anton's Gowt Lock.

Fishtoft is one of eighteen civil parishes which, together with Boston, form the Borough of Boston in the county of Lincolnshire, England. Local government has been arranged in this way since the reorganization of 1 April 1974, which resulted from the Local Government Act 1972. This parish forms an electoral ward in itself. Hitherto, the parish had formed part of Boston Rural District, in the Parts of Holland. Holland was one of the three divisions of the traditional county of Lincolnshire. Since the Local Government Act of 1888, Holland had been in most respects, a county in itself. The population of the civil parish at the 2011 census was 6,835.