The Black Sluice is the name given to the structure that controls the flow of the South Forty-Foot Drain into The Haven, at Boston, Lincolnshire, England.
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The main drain in the Black Sluice District, extending from Boston Haven to Gutheram Cote (sc. modern Guthram Gowt).
The main job of the Drain is to gather the waters pumped from the Kesteven Fens, the Holland Fens and the Weir Dyke, a soak dike in Bourne North Fen, alongside the Bourne Eau and River Glen, northwards and eastwards to the Black Sluice at Boston, where they are discharged to the tidal waters of The Haven.