Bac Mòr is a Scottish island, one of the Treshnish Isles,[3] sometimes referred to as The Dutchman's Cap in English because of its shape.

Bac Mòr is of ancient volcanic origin, and the peak in the middle is a former cone.

The low-lying plain surrounding it is a glassy lava field.

The remains of summer sheilings have been found on the island, suggesting that it was inhabited at one time, even though it has no safe landing places.

The Treshnish Isles, which are uninhabited today, are owned by a charity, the Hebridean Trust.