Course It originates, near some wind turbines, at what modern maps call Avonhead Cottage south of Upperton just west of Longriggend. Older maps show it near Avonhead just west of "Avonhead Rows" and north of "Avonhead Coal Pit No 9". Some maps show a stream coming from Fannyside Lochs in North Lanarkshire, some 3 miles (5 km) east of Cumbernauld,Royal Scottish Geographical Society, (2006), Scotland: an encyclopedia of places & landscapes, page 39 but that is not the Avon's source even if some water drains in a rivulet from there. The west of Fannyside Loch is the source of the Glencryan Burn which ends up in the River Carron via the Red Burn and the Bonny Water. Herd's Hill, the source of the Luggie Water which ends up in the River Clyde via the River Kelvin is close by. The first tributary of the Avon is the Shiellhill Burn on the south of Greengairs very close to the source of the Cameron Burn, which itself is a tributary of the Luggie Water.
Course It originates, near some wind turbines, at what modern maps call Avonhead Cottage south of Upperton just west of Longriggend. Older maps show it near Avonhead just west of "Avonhead Rows" and north of "Avonhead Coal Pit No 9". Some maps show a stream coming from Fannyside Lochs in North Lanarkshire, some 3 miles (5 km) east of Cumbernauld,Royal Scottish Geographical Society, (2006), Scotland: an encyclopedia of places & landscapes, page 39 but that is not the Avon's source even if some water drains in a rivulet from there. The west of Fannyside Loch is the source of the Glencryan Burn which ends up in the River Carron via the Red Burn and the Bonny Water. Herd's Hill, the source of the Luggie Water which ends up in the River Clyde via the River Kelvin is close by. The first tributary of the Avon is the Shiellhill Burn on the south of Greengairs very close to the source of the Cameron Burn, which itself is a tributary of the Luggie Water.