On the Shores of Loch Lomond and in Sterlingshire.
The traditional clan lands of the Buchanan border the eastern shores of Loch Lomond around the towns of Drymen, Milton of Buchanan, and Balmaha. It then extends eastward into Stirlingshire through the towns of Buchlyvie, Arnprior, Kippen and Callander just north of Stirling Castle.
Within Loch Lomond, just offshore from the town of Balmaha lies the tiny fish shaped island of Clarinch (or Clar Innis) which was the original fortress of the Clan. Some ruins still remain but the island is now overrun with brush and trees and is a protected sanctuary. It is this tiny isle that gives its name to the Clan slughorn or war cry of "Clar Innis!"