Carsaig Bay is a cove on the Ross of Mull in the south of the Isle of Mull, off the west coast of Scotland. It is situated eastward of Rudha Fhaoilean, and south of Pennyghael along a "narrow unclassified road". The bay is small and is surrounded by high, precipitous hills. It is unsafe for water craft, except in the part sheltered by the island of Gamhnach Mhòr, where small vessels can obtain anchorage. The northeastern part of Carsaig Bay is rocky and foul from offshore from the eastern end of Gamhnach Mhòr to the head of the bay. Three of the rocks are marked by perches to facilitate the approach to Carsaig Quay. The tidal streams along the south coast of Mull are weak westward of Carsaig Bay.
Geography and geology
The bay is on the south coast of the Ross of Mull and extends from Rubh' a' Chromain in the west to Carraig Mhòr in the east. It is accessible from the A849 from Craignure, which leads to an unclassified road east of Bunessan, the last stretch of which is steep and very narrow. The precipitous cliffs on this coast are tallest at Rudha Fhaoilean. where they are high at about inland. The coast from Rudha Fhaoilean to Rudha Dubh, the western point of the entrance to Loch Buie, a distance of to the east, is steep except where the bay is formed. This area affords some shelter by Gamhnach Mhòr. The cliffs are lined with basaltic columns, some of them attaining a diameter of. The Carsaig Arches, a natural formation situated at Malcolm's Point, are located west of the bay. One of the well known caves here is known as the Nuns Cave where nuns from the Iona Abbey used to escape from the rigours of reformation and hide here. The use of some of these caves reportedly dates back to the 6th century. It is also reported that during the 15th century, the monks of the Iona Abbey used to visit the shores and caves here to collect sea washed stones and carve them into artifacts and grave stones. Erosive action of the hills has created an amphitheater in basaltic formations rising to a height of . At the termination of the track the huge columnar basalts rise to a height of. Other formations seen are weathered sills and dykes. Fossils are a frequent find here. The site has sedimentary rocks of Palaeocene age. Cretaceous strata recorded here has geological formations of sandstones and mudstones with several chalkclasts. The sill formation noted here is the Rubh' a'Chromain which is formed of felsite, basalt and xenoliths.
Carsaig Pier and the boathouses, together with Carsaig House, feature extensively in the 1945 filmI Know Where I'm Going!, as does the incongruous telephone box next to the waterfall.
