History of Scottish Gaelic
All surviving dialects are Highland and/or Hebridean dialects. Dialects of Lowland Gaelic have become defunct since the demise of Galwegian Gaelic, originally spoken in Galloway, which seems to have been the last Lowland dialect and which survived into the Modern Period. By the 18th century Lowland Gaelic had been largely replaced by Lowland Scots across much of Lowland Scotland. According to a reference in "The Carrick Covenanters " by James Crichton, the last place in the Lowlands where Scottish Gaelic was still spoken was the village of Barr in Carrick: only a few miles inland to the east of Girvan, but at one time very isolated. Crichton gives neither date nor details.
Languages of Canada
Scottish Gaelic was spoken by many immigrants who settled in Glengarry County, Ontario and the Maritimes — predominantly in New Brunswick's Restigouche River valley, central and southeastern Prince Edward Island, and across the whole of northern Nova Scotia — particularly Cape Breton. While the Canadian Gaelic dialect has mostly disappeared, regional pockets persist. These are mostly centred on families deeply committed to their Celtic traditions. Nova Scotia currently has 500–1,000 fluent speakers, mostly in northwestern Cape Breton. There have been attempts in Nova Scotia to institute Gaelic immersion on the model of French immersion. As well, formal post-secondary studies in Gaelic language and culture are available through St. Francis Xavier University, Saint Mary's University, and The Gaelic College.