Inveruglas Isle (gd|Innis Inbhir Dhughlais) is a small uninhabited[1] island within Loch Lomond, and lies off the shore at Inveruglas opposite Inversnaid at the north end of the loch. It is opposite the Loch Sloy powerstation.[2]
The name Inbhir Dhu(bh)ghlais means "mouth of the black stream"; Inveruglas Isle is therefore, quite literally, the island at the mouth of the black stream.
The island houses the ruins of a castle which was once home to the chiefs of the Clan MacFarlane, destroyed in the seventeenth century by Oliver Cromwell's Roundhead troops.[2] https://web.archive.org/web/20120218135111/http://www.incallander.me.uk/loch-lomond.htm