The land of Skyrim is the most rugged on the continent, containing four of the five highest peaks in Tamriel (see Places of Note: Throat of the World). Only in the west do the mountains abate to the canyons and mesas of the Reach, by far the most cosmopolitan of the Holds of Skyrim, Nords of the pure blood holding only the barest majority according to the recent Imperial Census. The rest of Skyrim is a vertical world: the high ridges of the northwest-to-southeast slanting mountain ranges, cleft by deep, narrow valleys where most of the population resides. Along the sides of the river valleys, sturdy Nord farmers raise a wide variety of crops; wheat flourishes in the relatively temperate river bottoms, while only the snowberry bushes can survive in the high orchards near the treeline. The original Nord settlements were generally established on rocky crags overlooking a river valley; many of these villages still survive in the more isolated Holds, especially along the Morrowind frontier. In most of Skyrim, however, this defensive posture was deemed unnecessary by the mid-first era, and most cities and towns today lie on the valley floors, in some cases still overlooked by the picturesque ruins of the earlier settlement.