I already had the OS 1:25,000 map of the Cuillin and Torridon hills, but this is much better. The bolder, more colourful mapping is much easier to read. The main part of this map covers an area from Broadford in the east to Glenbrittle in the west, Sligachan in the north and Loch Scavaig in the south. This itself is a great map, but what is printed on the other side makes it even more vaulable. Here we have an expanded (1:12,500) map of the whole of the Black Cuillin Ridge including a key to crag names/climbing areas. Also on this side is a simplified diagram showing the main ridge and its spurs and all of the possible escape routes, visitor and travel information including some useful phone numbers, a glossary of Gaelic names and the Scottish outdoor access code. Given the inhospitable terrain, the unpredictability of the mountain weather, and the tricks played on compasses by the magnetic rock in the Cuillin, it would be daft to venture up there without the best map you can find. Hence the title of this review. By the way, I've never seen any of these Harvey maps cheaper than here on Amazon.