The Treshnish Isles are now under the protection of the National Trust for Scotland.
It means the remote archipelago of eight uninhabited islands and numerous skerries will now be conserved and protected by the charity.
The Treshnish Isles are located in the Inner Hebrides to the west of Mull.
It is a Site of Special Scientific Interest due to its unique landscape, which provides nesting areas for many seabirds including guillemots, razorbills, puffins, kittiwakes, fulmars, shags and skuas.
The marine environment around the isles is part of the Sea of the Hebrides Marine Protected Area due to the presence of basking sharks and minke whales. Bottlenose and common dolphins, as well as grey seals, are also found there.
In addition, the islands also contain the protected archaeological remains of two medieval chapels, a centuries-old castle and an 18th century barracks.
The Treshnish Isles have been in the care of The Hebridean Trust since 2000 and were transferred to the National Trust for Scotland this month.
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National Trust for Scotland chief executive Philip Long said the organisation was “privileged” to take on the role of protecting the islands, which are “so rich in natural habitats and wildlife”.
He added: “Uninhabited islands are invaluable as havens for wildlife and as places of great natural beauty.
“Looking after them is a great responsibility, which we are proud to undertake, and which, as an independent charity, is only made possible thanks to the generosity of our members and supporters.
“Building on the work of the Hebridean Trust, our experts will focus on ensuring that the Treshnish Isles are conserved and protected now and for the future, and that people can share in their nature, beauty and heritage.”
Mike Stanfield, chair of the Hebridean Trust, added: “The focus for the Hebridean Trust has now shifted towards community projects on Tiree and so we are very pleased that the National Trust for Scotland has agreed to take the Treshnish Isles into their care for the nation.”