a short walk around the headland east of sango bay to Smoo Cave with some great limestone formations along the coast.
The cave was formed along two geological lines of weakness by a combination of erosion from the sea and an inland underground stream which has formed the innermost chambers. Upstream of the Allt Smoo which runs into the cave, impermeable quartzites have been faulted against the Durness Limestone, causing the stream to sink down into the carbonate rock soon after it has crossed the contact between the two different rock types.
The cave entrance and main chamber have been considerably enlarged by sea action to approximately 40 metres (130 ft) wide and 15 metres (49 ft) high, the largest sea cave entrance in Britain. The entrance is located at the end of a 600 metres (660 yd) long tidal gorge (Geodha Smoo) which was once part of the cave, now collapsed.
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