The B8045 is a narrow 8 mile long road running south-east to north-west across the island of Lismore in the Inner Hebrides: it is by default the main road on the island. An unclassified track segues into the official B road at grid reference NM817380(Co-ordinates 56º29’1"N 5 º32’45"W) and passes through remote settlements at Kilcheran, Baligrundle and Balliveolan and the spring at Killandrist before reaching the Cathedral of St Moluag at Clachan. A track westwards from the main road at this point leads to Castle Coeffin.