Inchmurrin () is an island in Loch Lomond in Scotland. It is the largest fresh water island in the British Isles. Geography and geology Inchmurrin is the largest and most southerly of the islands in Loch Lomond. It reaches a height of towards the north and is largely wooded. There is an excellent view of the north end of the loch. Along with Creinch, Torrinch, and Inchcailloch, Inchmurrin forms part of the Highland boundary fault. History Inchmurrin was the site of a 7th-century monastery, with a chapel dedicated to Saint Mirin, after whom it was named. The island was formerly a deer park of the Dukes of Montrose, who had a hunting lodge built in 1793 and maintained a gamekeeper and his family there. 200 deer are recorded in 1800. There are ruins of a castle, probably built for Duncan, 8th Earl of Lennox whose seat was Balloch Castle at the south end of Loch Lomond. The castle was probably a hunting lodge for the deer park established on the island by King Robert I of Scotland in the early 14th century. After her husband Murdoch Stewart, Duke of Albany, father Donnchadh, Earl of Lennox, and two sons were executed by James I in 1425, Isabella Countess of Lennox retired to the castle on Inchmurrin with her grandchildren. In 1417, Iain Colquhoun of Luss was killed here by robbers. Sir John Colquhoun of Luss, governor of Dumbarton Castle, was murdered at Inchmurrin in 1439, during a raid led by Lachlan MacLean. A French ambassador, Monsieur de Béthune, brother of the Duke of Sully, came in July 1599 and went on a hunting progress with James VI from Falkland Palace to Inchmurrin and Hamilton Palace. In 1617 King James made his only return visit to Scotland, and included Inchmurrin in his itinerary to go hunting. The Duke of Lennox wrote to the custodian of the island on 23 July 1617, asking for food to be prepared for "a good nombre of sharpe stomaches", probably a reference to the hunting trip. Rob Roy raided the island. At one point, his men came to control all the boats on the River Endrick and Loch Lomond, which were later used to remove cattle from Inchmurrin. Inchmurrin was used as a mental asylum, and also unmarried pregnant women were sent here to give birth. The English travel writer, H.V. Morton visited Inchmurrin in the 1930s