[1] Welches Dam is the site of the visitor centre for the RSPB Ouse Washes reserve.[2][3] The parish of Welches Dam was surrounded by those of Coveney, Manea, Mepal, and Witcham.The original principal drainage channel for the area, the Old Bedford River, ran through the parish.The parish's name derived from Edward Welsh who built a dam across the Bedford River.Welsh was an employee of the Adventurers, the 17th-century entrepreneurs who invested in the results of Vermuyden's efforts to drain the fens.