Argyll is part of the Scottish Highlands. Just by looking at this map postcard to your left, you can see how mountainous the northwestern two-thirds of the nation is - this comprises the Highlands, more or less. The Scottish Highlands are quite empty - they have one of the least-densely populated areas in all of Europe. Culturally, the Scottish Highlands is quite different than the neighboring Lowlands. The peoples of the Highlands were traditionally the Gaelic-speaking Scotsman, and some rural areas of the Outer Hebrides (the larger islands northwest of the mainland) still speak Gaelic. This makes Gaelic Highland Scotland more linguistically related to Ireland than to mainland Britain.
The region of Argyll (see here for map) is a coastal region of the Scottish Highlands, and the second largest county in Scotland. The name derives from the Old Gaelic airer Goídel, or "border region of the Gaels." The word airer carries the additional meaning of the word "coast" when applied to maritime regions, so the place name can also be translated as "Coast of the Gaels." The largest two towns in this sparsely-populated county have just barely over 8,000 people. The county's third-largest town, Campbeltown (pop. 5144), is historically known as a whiskey-producing region and home to distilleries such as Glengyle and Glen Scotia.
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The Campbell clan's name derives from the Gaelic caimbeul, meaning "wry mouth," "crooked mouth," or "twisted mouth." The earliest known Campbell is Gilleasbaig of Menstrie, who was active around the year 1260. The Clan Campbell tartan, known as Black Watch, is highlighted in a red box on the above postcard. And in case you were wondering: your favorite pair of argyle socks do, in fact, get their name from the Argyll region of Scotland.
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The castle is now under the protection of the Scottish government, and you can visit it in the summer time by boat or on foot. You can read more history of the castle and see many lovely photos at this Undiscovered Scotland website.