* Astronomy

Ardnamurchan (Scottish Gaelic: Àird nam Murchan: headland of the great seas) is a 130 km² peninsula in Lochaber, Highland, Scotland, noted for being very unspoilt and undisturbed.
The whole north western corner of Ardnamurchan contains a complex of volcanic structures, often described approximately as a "Caldera". Broadly, this area is the underground structures of a 55 million-year-old volcanic complex (relatively small areas of lavas that were erupted onto the surface are found in some parts of the peninsula). At least 7 other similar complexes of the same tectonic episode are dotted up the west coast of Britain, and so are popular stops in geological training courses from many universities.
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Google earth file: Ardnamurchan caldera.kmz (2kb, kmz)