Ardnamurchan Point is the most westerly point on the British mainland and sits on a dark-coloured, coarse-grained, basic intrusive igneous rock. This rock was formed from magma deep within the earth and has relatively large crystals composed mainly of pale plagioclase feldspar with quartz. The gabbro has been exposed through erosion and is characteristic of most of the west end of the Ardnamurchan Peninsula.
Take time to visit The Ardnamurchan Lighthouse and Exhibition Centre. The exhibition centre at the Ardnamurchan lighthouse has some interesting displays about the geology of the Ardnamurchan Peninsula and beyond. There is also a small cafe and shop, several picnic benches and a small covered observation point.
From the lighthouse, there are some lovely views of the Ardnamurchan coastline and the Small Isles, and with more distant views of Treshnish Isles on a fine day.
The Ardnamurchan Lighthouse can be reached by heading west along the Ardnamurchan peninsula on the B8007 towards Kilchoan. Once past Kilchoan, take the minor road on the left at Achosnich, as signposted.