Treshnish Isles Islands

Address: Treshnish Isles, Inner Hebrides, Scotland

The Treshnish Isles are an uninhabited archipelago off the west coast of the Isle of Mull in the Inner Hebrides of Scotland. The isles are notable for their seabird colonies and scenic volcanic-formed landforms.

Large breeding colonies of Atlantic puffins, guillemots and other seabirds concentrate on the islands in late spring and summer, and grey seals haul out on offshore rocks. Boat trips from Mull provide the principal visitor access and close-up views of the wildlife and coastline.

The isles have been used seasonally for grazing and have long attracted naturalists for their rich birdlife; they are now managed for nature conservation and visitor guidance. Geological features include remnants of volcanic activity that shaped the islands.

Located off the western coast of Mull in Argyll and Bute, the Treshnish Isles sit in the Inner Hebrides and are reached by sea from Mull, with Tobermory commonly serving as a departure point.

• Best time and access: Best wildlife viewing for seabirds, particularly puffins, is typically from late spring through summer; organised boat trips from Mull (for example from Tobermory) are the usual means of access.

What to See#

• Lunga: Lunga is the largest of the isles and hosts the main seabird colonies, including large numbers of Atlantic puffins during the breeding season.
• Bac Mr: Bac Mòr, often called the Dutchman’s Cap because of its distinctive conical shape, is a small, steep island visible from boat routes around the group.
• Fladda: Fladda is a smaller island with rocky shores that contributes to the islands’ overall bird and seal habitats and is often included on boat trips.

Excursions to the Treshnish Isles run from the Isle of Mull, typically Tobermory or nearby harbours. Boat operators offer guided wildlife trips; private charters available for those with their own vessel. Sea conditions dictate schedules and landing possibilities.

• Boat trips from the Isle of Mull depart Tobermory or nearby harbours; check sea conditions - crossings can be rough.
• Bring binoculars for seabird colonies and seals; puffin viewing is best May-July.
• Respect breeding seasons and stay on marked landing areas; some parts are wildlife protection zones.