Muck (; ) is the smallest of four main islands in the Small Isles, part of the Inner Hebrides of Scotland. Today, much of the island is used for grazing. Residents use wool to make rugs and clothing. There are several ancient monuments and some facilities for visitors. The few residents are served by a single school, Muck Primary School & Nursery. The island is owned by the MacEwen family.

Geology

The larger part of the island is formed from olivine-phyric basalt flows erupted during the Palaeocene. Flows of hawaiite can also be found around the south coast. Together these form the Eigg Lava Formation, a greater part of which is exposed on Eigg itself. The lava flows are cut through by a swarm of Palaeocene age basalt and dolerite dykes generally aligned NNW-SSE. A handful of faults are mapped on a similar alignment, the most significant one of which stretches SE from Bagh a Ghallanaichy of Laig. Gabbro is exposed along the eastern side of the bay of Camas Mor whilst on its western side are a suite of sedimentary rocks including small exposures of the Valtos Sandstone, Duntulm and Kilmaluag formations representing the upper part of the middle Jurassic Great Estuarine Group which is more extensively exposed on nearby Eigg.

There are some peat and till deposits on the island, albeit restricted in extent.

Geography

Muck is adjacent to the other Small Isles (Canna, Rùm and Eigg). It measures roughly east to west. The island's tallest hill is Beinn Airein ().

The island's population was 28 as recorded by the 2022 census, just one more than the figure in the 2011 census and five fewer than the 31 usual residents in 2001. The populace mostly live near the harbour at Port Mòr. The other settlement on the island is the farm at Gallanach. The island's only road, about long, connects the two.

Muck is also known for its seal population, and for the porpoises in the surrounding waters.

Facilities

A causeway and slipway were built at Port Mòr in 2005. This allows vehicles to be driven on and off the Caledonian MacBrayne ferry, , which links Muck and the neighbouring Small Isles with the mainland port of Mallaig (2½ hours away). However, visitors are not normally permitted to bring vehicles to the Small Isles. During the summer months the islands are also served by Arisaig Marine's ferry MV Sheerwater from Arisaig, south of Mallaig. It is featured in the on-line newspaper West Word.

The island has no church, shop or post office, and, uniquely among Scottish islands with a population of this size, it has no post box. Until 1970 it had no electricity supply; this was initially provided by means of diesel generators, but in 1999 two large wind turbines were built. There is a hotel, Gallanach Lodge, and a range of other holiday accommodation.

Etymology

The English name of the island derives from the Gaelic word muc which James Boswell in 1785 took this to mean that the name of the island meant Sow's Island. It is now thought to refer to the high number of porpoises around it, loosely called muc-mhara 'sea-pig' (cf mereswine). The laird in Boswell's era disliked the name, especially as it meant him being referred to as Muck, and thus had attempted to persuade Samuel Johnson and Boswell that the authentic name was "Isle of Monk". nevertheless, the Treaty explicitly preserved the status of the various divisions of Suðreyjar as crown dependencies, leaving the Bishop effectively sovereign. Awkwardly, the Bishopric remained part of the Norwegian Archdiocese of Niðarós, until Shetland and Orkney also joined the Scottish king's possessions, in 1472 (at which point the Bishopric became part of the new Archdiocese of St Andrews).

thumb|Ponies on Muck

In 1549, conducting a survey, the Dean of the Isles (Donald Monro) wrote:

The Dean's account is the first known written reference to Muck. He went on to describe the offshore islet of Eilean nan Each as "in Englishe the Horse ile, guid for horse and uther store, perteining to the Bishope of the iles.".

According to the Bishop's rental accounts, of 1561, his tenants in Muck were the MacIans. The MacIans were the lairds of Ardnamurchan on the adjacent mainland, but no records have yet been found to indicate when or why they became tenants on Muck as well; Muck is the most fertile of the Small Isles, so the land would certainly have been desirable.

MacLeans and MacIans

thumb|left|Northern coastline

The MacIans were a branch of the MacDonalds, with whom the MacLeans of Duart had a longstanding feud, concerning the Rhinns of Islay. In 1588, some of the remains of the Spanish Armada found refuge with the MacLeans, who demanded the Spanish supply 100 soldiers, in return for refuge; they having agreed, the Maclean leader<!-- if you call him "Lachlan", this section will get quite confusing--> took the opportunity to attack the Small Isles in relation to his feud with the MacDonalds. The MacIans fought them off, and the Spanish eventually departed from the region without even paying for the provisions given to them by the MacLeans.

The Scottish reformation was rapidly sweeping through the region at this time; the MacLeans, and even Dean Monro himself, became presbyterians. In 1617, Andrew Knox, a presbyterian who reluctantly held the post of Bishop of the Isles, sold Muck to Lachlan Maclean, the laird of Coll. Lachlan expelled the MacIans at once, then gave Muck to his younger son, Hector. Coll, along with the lands of the MacLeans of Duart, was under the shrieval authority of the sheriff of Argyll; under pressure from the Earl of Argyll, one of the most powerful Scottish political figures of the age, shrieval authority over Muck was transferred from Inverness to the latter sheriff, which was under the control of the Earl's family.

In 1650, the MacIans lost control of Ardnamurchan as well, and decided to seek revenge on Hector for the way Lachlan had treated them. They landed on Muck at night, and started rustling away the cattle. Hector happened to be outside at the time, and shot at them; in turn, Gillespie MacIan Shaor, one of the MacIans present, shot back, killing Hector. By this point Hector had a son, and therefore founded the line of MacLeans of Muck. Their comital authority was extinguished by the Heritable Jurisdictions Act, in 1746, but they retained considerable power as lairds.

Religion and disease

thumb|South west coast

On Muck, the reformation had left the population balanced between presbyterians and Roman Catholics; in 1764, each amounted to nearly half the population. A few years later, however, the MacLeans Lairds began a campaign of religious persecution, demanding that all tenants renounce the Catholic Church in Scotland, or face eviction. In 1770, the MacLean laird's wife even arrested up a Roman Catholic priest, who had just arrived to visit the Catholic population of Muck, telling him she was following "Boisdale's example"; the priest was deported to the Scottish mainland as soon as a ship became available.

Prosperity and poverty

thumb|left|A steep coastal valley

Johnson's work also gives an insight into the prosperity on Muck: