Scotland's main mountainous region can be broadly further split into the Northwest Highlands, the Grampian Mountains and the islands off the west coast. As the name implies, the NW Highlands begin at the suture north and west of the Great Glen and include 100 of the 282 Munros. The mountains found here are generally very rough and steep, but can also often provide walking on short grass. Long ridges are to be found on both sides of Glen Shiel in Kintail and more range-like mountains are to be found further north, such as in the Fannichs. The Torridon Hills are exceptionally well-regarded by hillwalking, scrambling and climbing communities; some of them, such as Beinn Eighe, are crowned by white quartzite, which gives a highly-distinctive appearance. The trend continues to the north, with larger caps of the white rock at Foinaven and Arkle. Some of these hills are made of Lewisian Gneiss, making them some of the oldest rocks on Earth. Many of the peaks within this region are isolated, particularly within Assynt and Sutherland, and, although sometimes smaller, possess a great grandeur. These include: Stac Pollaidh, Suilven, An Teallach and Maiden Pap. The southern portion of this area south of Glenfinnan consists of lower mountains of Corbetts and Grahams, but maintain the rough character of those found further north. The highest mountain in this area is Càrn Eige, also the second most prominent mountain in Britain, although twelfth by height.