Wikipedia
Dumgoyne is a hill prominent on the edge of the Campsie Fells and is a well known landmark visible from Glasgow. It is a volcanic plug and is high. The plug is readily reached from a path beside Glengoyne Distillery or via a water-board track from the village of Strathblane three miles to the east or Killearn to the west.
From Strathblane, the path begins at the entrance to a private road. Here the car can be parked by the roadside, and the walk begins by following this private road for approximately two miles. After passing several gates on the way, turn to the right where there is another gate. Follow this path up and around the side Dumfoyn, and from here the path steepens, as it goes up Dumgoyne. The summit is marked by a small standing stone erected some years ago by local Rotarians. This route to Dumgoyne passes close to the Spittal of Ballewan (545811) the former site of a medieval Knights Templar hospital.
Close to Dumgoyne is Dumfoyn (547825; 421m) a similar but less remarkable and much less climbed hill. From these hills the much smaller but heavily wooded Dumgoyach (531810;108m) can be seen. This fine hill is well worth a visit if one is walking on the West Highland Way as the Way goes beside Dumgoyach. However, do not damage any fences as it is exclusion of sheep that has allowed Dumgoyach to retain its wooded slopes. Dumgoyach due to its association with the Edmonstons of Duntreath provides a historic link with Alice Keppel and the Duchess of Rothesay, Duchess of Cornwall, Camilla, Duchess of Cornwall.