The Treshnish Isles lie to the west of Mull, Ulva and Gometra in the Tiree Passage. From Bac Beag in the south-west to Carnaburg Beag in the north-east is around 8 miles (11km). Lunga is the largest in size, and the main centre of bird breeding. The others of any reasonable size are the Dutchman's Cap, Sgeir an Eirionnaich, Sgeir an Fheoir, Fladda and the Carnaburg Mor.
Historically the Carnaburgs are by far the most important having been fortified for many centuries. Particularly important during the period of Viking occupation of the Western Seaboard and after there are still remains of fortifications to be seen on both. The Carnaburg Mor still boasts the gables of an ancient chapel and barrack room. The last garrison was probably prior to the Jacobite uprising of 1745/6.
The Treshnish Isles were purchased by the Hebridean Trust in 2000.
Their stated mission is to:
- Provide protection in perpetuity for the landscape, wildlife and amenity of the Islands.
- Monitor the evolution of the islands as attractions for the general public, as habitat for wildlife and, where appropriate, to introduce management policies which enhance the heritage value of the islands on all fronts in a balanced manner.
To use the islands as an educational tool, in conjunction with another ongoing educational project concerning the Hebrides, and to document the archaeology and history of the islands.