The Isle of Bute (Scottish Gaelic: Eilean Bhòid or An t-Eilean Bhòdach) is an island in the Firth of Clyde, off the west coast of Scotland. Administratively it's part of Argyll and Bute in the Scottish Highlands. Indeed the Highland fault line runs through it, from the bay and main town of Rothesay halfway down its east coast, through freshwater Loch Fad and Loch Quien to Scalpsie Bay on the south coast. So most of the island, west of this line, is geologically Highland, but it's of no great height, and Bute is lowland in nature. For visitor purposes it's part of the "Costa Clyde" or "Glasgow Riviera", the string of little resorts stretching down the Clyde coast from Gourock through Ayr to Girvan. With only a short ferry crossing from Wemyss Bay on the mainland, it's popular with day trippers from Glasgow and never feels "away from it all".
The only way into Bute, unless you've a light aircraft. Most visitors arrive in 1 Rothesay on the Calmac ferry from Wemyss Bay 30 miles west of Glasgow. This takes 35 mins and sails at least hourly every day year-round 07:00-20:00. Return fares are £24 per car plus £6.70 per passenger including driver.