What river is the castle that a stone was taken from to build the L-plan tower for Barscobe Castle on?
Threave Castle Threave Castle is situated on an island in the River Dee, 2.5 km west of Castle Douglas in Dumfries and Galloway, south-west Scotland.
Castle of Alcoutim The Castle of Alcoutim (Portuguese: "Castelo de Alcoutim" ) is a medieval castle in the civil parish of Alcoutim, in the municipality of the same name, in the southeastern Algarve of Portugal. Built in the 13th century, the castle stands in a dominant position on a hill south of the parish seat of Alcoutim on the right bank of the San Marcos River (tributary of the Guadiana River), opposite the territory of Sanlúcar de Guadiana (in Spain).