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Iona lies approximately 1.6 kilometres (1 mi) from the coast of Mull. It is 1.6 kilometres (1 mi) wide and 5.6 kilometres (3 mi) long with a resident population of 125. The geology of the island consists mainly of Precambrian Lewisian gneiss with Torridonian sedimentary rocks on the eastern side and small outcrops of pink granite on the eastern beaches. Like other places swept by ocean breezes, there are few trees with most of these being located around the parish church area.

Iona's highest point is Dùn Ì, 101 metres (331 ft), an Iron Age hill fort dating from 100 BC-200 AD. Its geographical features include the Bay at the Back of the Ocean and Càrn Cùl ri Éirinn (the Hill/Cairn of [turning the] Back to Ireland), said to be adjacent to the beach where St. Columba first landed.

The main settlement, located at St. Ronan's Bay on the eastern side of the island, is called Baile Mòr and is also known locally as "The Village". The primary school, post office, the island's two hotels, the Bishop's House and the ruins of the Nunnery are here. The Abbey and MacLeod Centre are a short walk to the north. Port Bàn (white port) beach on the west side of the island is home to the Iona Beach Party.

There are numerous offshore islets and skerries of which Eilean Annraidh (island of storm) and Eilean Chalbha (calf island) to the north, Rèidh Eilean and Stac MhicMhurchaidh to the west and Eilean Mùsimul (mouse holm island) and Soa Island to the south are amongst the largest. The steamer Cathcart Park carrying a cargo of salt from Runcorn to Wick ran aground on Soa on 15 April 1912, the crew of 11 escaping in two boats. Iona was the site of a highly important monastery (see Iona Abbey) during the Early Middle Ages. According to tradition the monastery was founded in 563 by the monk Columba, also known as Colm Cille, who had been exiled from his native Ireland as a result of his involvement in the Battle of Cul Dreimhne. Columba and twelve companions went into exile on Iona, then part of the Irish kingdom of Dál Riata, and founded a monastery there. The monastery was hugely successful, and played a crucial role in the conversion to Christianity of the Picts of present-day Scotland in the late 6th century and of the Anglo-Saxon kingdom of Northumbria in 635. A large number of satellite institutions were founded, and Iona became the centre of one of the most important monastic systems in Great Britain and Ireland.

Iona quickly became a renowned center of learning, and its scriptorium produced highly important documents, likely including the original texts of the Iona Chronicle, thought to be the source for the early Irish annals. The monastery is often associated with the distinctive practices and traditions known as Celtic Christianity. In particular, Iona was a major supporter of the "Celtic" system for calculating the date of Easter during the time of the Easter controversy, which pitted supporters of the Celtic system against those favoring the "Roman" system used elsewhere in Western Christianity. The controversy weakened Iona's ties to Northumbria, which adopted the Roman system at the Synod of Whitby in 664, and to Pictland, which followed suit in the early 8th century; Iona did not do so until 715 according to Bede. Iona's prominence was further diminished over the next centuries as a result of Viking raids and the rise of other powerful monasteries in the system, such as the Abbey of Kells.

The Book of Kells may have been produced or begun on Iona towards the end of the 8th century. Around this time the island's exemplary high crosses were sculpted; these may be the first such crosses to contain the ring around the intersection that became characteristic of the "Celtic cross". However, the series of Viking raids on Iona began in 794 and, after its treasures had been plundered many times, Columba's relics were removed and divided two ways between Scotland and Ireland in 849 as the monastery was abandoned. Though Iona was never important again to Ireland, it rose to prominence again in Scotland following the establishment of the Kingdom of Alba in the later 9th century. The ruling dynasty of Alba traced its origin to Iona, and the island thus became an important spiritual centre of the new kingdom, with many of its early kings buried there.