The River Dee (Scottish Gaelic: Dè / Uisge Dhè), in south-west Scotland, flows from its source in Loch Dee amongst the Galloway Hills, firstly to Clatteringshaws Loch, then into Loch Ken, where it joins the Water of Ken. From there, the Dee flows 15 miles (24 km) southwards to Kirkcudbright, and into Kirkcudbright Bay to reach the Solway Firth. The distance is just over 38 miles (61 km) in total. Together with its tributaries, the Dee's total catchment area is over 400 square miles (1,000 km2). The ruins of Threave Castle stand on an island on the lower part of the Dee.