Measuring just over four miles by one, and with a population of around twenty, Canna is run as a single farm and bird sanctuary by the National Trust for Scotland. For visitors, the chief pastime is walking: from the dock it’s about a mile across a grassy basalt plateau to the bony sea cliffs of the north shore, which rise to a peak around Compass Hill (458ft) – so called because its high metal content distorts compasses – in the northeastern corner of the island, from where you get great views across to Rùm and Skye. The cliffs of the buffeted western half of the island are a breeding ground for Manx shearwater, razorbill and puffin.