Question: Barscobe Castle used stone taken from a castle in what Scottish river?

full_context: Document 1: River Dee, Galloway: 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 mi southwards to Kirkcudbright, and into Kirkcudbright Bay to reach the Solway. The distance is just over 38 mi in total. Together with its tributaries, the Dee's total catchment area is over 400 sqmi .
Document 2: Ardrossan Castle: Ardrossan Castle is situated on the west coast of Scotland in the town of Ardrossan, Ayrshire. The castle, defended by a moat, stands on a ridge above the town. There is a keep dating from the fifteenth century, and a vaulted range containing a kitchen and cellars. In a deep passageway there is a well. Part of the keep remains up to the corbels of the parapet, but it is in ruins. The original castle, owned by Clan Barclay, was partly destroyed during the Wars of Scottish Independence. This event, in which the English garrison were slaughtered, became known as "Wallace's Larder," a name which is still applied to the remaining vaults. Rebuilt by Clan Montgomery in the 15th century, Ardrossan later fell into disuse and was partially demolished by the soldiers of Oliver Cromwell in the 17th century who used the stones to help construct the Ayr Citadel.
Document 3: 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.
Document 4: Balloch Castle: Balloch Castle is an early 19th-century country house situated at the southern tip of Loch Lomond, in West Dunbartonshire, Scotland. Balloch was a property of the Lennox family from the 11th century, and the old castle was built in the 13th century. In the 19th century the estate was purchased by John Buchanan of Ardoch, who demolished the ruins of the old castle and erected the present building. The Tudor Gothic architecture is the work of Robert Lugar. In 1915 Balloch was bought by Glasgow City Corporation, and has been leased by West Dunbartonshire Council since 1975. The estate was designated as a country park in 1980, and since 2002 has been part of Loch Lomond and The Trossachs National Park. Although the house has been periodically used for visitor facilities and council offices, it is now included on the Buildings at Risk Register. Balloch Castle is a category A listed building, and the estate is included on the Inventory of Gardens and Designed Landscapes in Scotland.
Document 5: Fetteresso Castle: Fetteresso Castle is a 14th-century towerhouse, rebuilt in 1761 as a Scottish gothic style Palladian manor, with clear evidence of prehistoric use of the site. It is situated immediately west of the town of Stonehaven in Kincardineshire slightly to the west of the A90 dual carriageway. Other notable historic fortified houses or castles in this region are Dunnottar Castle, Muchalls Castle, Fiddes Castle, Cowie Castle and Monboddo House.
Document 6: Dunderave Castle: Dunderave Castle is an L-plan castle built in the 16th century as the Scottish seat of the MacNaughton clan. The castle lies on a small promontory on the northern shores of Loch Fyne, around 5 km north-east of Inveraray, Argyll. The castle is in use as a residence. The present castle was built after their previous castle was destroyed following a Plague infection. The old castle, and remnants of McNaughton crannógs, can still be seen on the lochan known as the Dubh Loch at the head of Glen Shira.
Document 7: Tibbers Castle: Tibbers Castle is a motte-and-bailey castle overlooking a ford across the River Nith in Dumfries and Galloway, Scotland. To the east is the village of Carronbridge and to the north west is a 16th-century country house, Drumlanrig Castle.
Document 8: Tower of Hallbar: The Tower of Hallbar, also known as Hallbar Tower and Braidwood Castle, is a 16th-century tower house, located to the west of the River Clyde in South Lanarkshire, Scotland. The tower is situated above the Fiddler Burn, 3.5 km south-west of Carluke, and 1.5 km east of Crossford. It has recently been restored and is let out as holiday accommodation.
Document 9: Caerlaverock Castle: Caerlaverock Castle (from "caer laverock", "lark castle") is a moated triangular castle first built in the 13th century. It is located on the southern coast of Scotland, 11 km south of Dumfries, on the edge of the Caerlaverock National Nature Reserve. Caerlaverock was a stronghold of the Maxwell family from the 13th century until the 17th century when the castle was abandoned. It was besieged by the English during the Wars of Scottish Independence, and underwent several partial demolitions and reconstructions over the 14th and 15th centuries. In the 17th century, the Maxwells were created Earls of Nithsdale, and built a new lodging within the walls, described as among "the most ambitious early classical domestic architecture in Scotland". In 1640 the castle was besieged for the last time and was subsequently abandoned. Although demolished and rebuilt several times, the castle retains the distinctive triangular plan first laid out in the 13th century. Caerlaverock Castle was built to control trade in early times.
Document 10: Kelburn Castle: Kelburn Castle is a large house near Fairlie, North Ayrshire, Scotland. It is the seat of the Earl of Glasgow. Originally built in the thirteenth century (the original keep forms the core of the house) it was remodelled in the sixteenth century. In 1700 the first Earl made further extensions to the house in a manner not unlike a French "château" which is virtually how it appears today. In 1977 the house and grounds opened to the public as a country park. It is one of the oldest castles in Scotland and has been continuously inhabited by the same family for longer than any other. The castle is protected as a category A listed building, while the grounds are included in the Inventory of Gardens and Designed Landscapes in Scotland.
Document 11: Threave Rovers F.C.: Threave Rovers Football Club are a football club from Castle Douglas in Dumfries and Galloway, Scotland. Formed in October 1953, the club plays its home games at Meadow Park and plays in the South of Scotland Football League.
Document 12: River Dee, Wales: The River Dee (Welsh: "Afon Dyfrdwy" , Latin: "Deva Fluvius" ) is a river in the United Kingdom. It flows through parts of both Wales and England, forming part of the border between the two countries.
Document 13: Thirlestane Castle: Thirlestane Castle is a castle set in extensive parklands near Lauder in the Borders of Scotland. The site is aptly named Castle Hill, as it stands upon raised ground. However, the raised land is within Lauderdale, the valley of the Leader Water. The land has been in the ownership of the Maitland family since 1587, and Thirlestane served as the seat of the Earls of Lauderdale. The castle was substantially extended in the 1670s by the first and only Duke of Lauderdale. Further additions were made in the 19th century. The castle is now cared for by a charitable trust, and is open to the public.
Document 14: Barscobe Castle: Barscobe Castle is a 17th-century tower house in Balmaclellan, Kirkcudbrightshire, Scotland. It is a typical house of a country laird, and according to a panel above the entrance, was built in 1648. The L-plan tower was constructed using stone taken from Threave Castle. The main block is three storeys high with the stair wing one storey higher. The gables have a modification of crowsteps found only in Galloway. It is a fine example of a mid-17th-century house which was unoccupied for many years until 1971 when it was restored. It has a modern byre (barn) attached, which has been converted into a garage. Barscobe Castle is a category A listed building.
Document 15: Douglas Castle: Douglas Castle was a stronghold of the Douglas family from medieval times to the 20th century. The first castle, erected in the 13th century, was destroyed and replaced several times until the 18th century when a large mansion house was built in its place. This too was demolished in 1938, and today only a single corner tower of the 17th-century castle remains. The castle was the former family seat of the Prime Minister, Sir Alec Douglas-Home. The castle was located around 1 km north-east of the village of Douglas, South Lanarkshire, in south-west Scotland. The remains are protected as a category C listed building.
ground_truth: Dee