Innis Mhòr is a tidal island in the Dornoch Firth of Easter Ross off the east coast of Scotland.

It is about 26 hectares (64 acres) in extent and is largely, if not exclusively made up of moving sand dunes.

[3] Innis Mhòr is one of the few east coast islands, only 4 of which exceed 20 hectares (49 acres) in size.

Inland there is the Morrich More, an extensive area of dune grassland with wetland communities,[5] and a grade 1 SSSI, and RAF Tain, a bombing range on an alluvial plain known as the Fendom.

[8] Local birdlife includes important populations of osprey (10 pairs representing about 10% of the UK breeding population), bar-tailed godwit, greylag goose and wigeon and numerous more common species such as curlew, dunlin, oystercatcher and teal.