Bishops Pond (Welsh: Pwll yr Esgob) is a Site of Special Scientific Interest in Carmarthenshire, Wales, lying adjacent to the former palace of the Bishop of St Davids (now the Carmarthenshire County Museum). The pond is an oxbow lake, formed when a meander of the River Tywi got cut off from the main river. The water level is topped up in winter as the river floods the valley floor, and the level drops in summer. The pond exhibits a natural succession from lake through swamp to marsh, and will eventually become meadow; this happens because aquatic plants clog the water and there is a gradual build up of organic detritus.