The routes in this guide have been selected from four areas: Carneddau, Glyders, Snowdon and Outlying Areas (comprising Moelwyns, Eifionydd, Rhinogs, Cader Idris, Arans and Arenigs), each of which has its own peculiar charm. The areas also vary in terms of popularity. Snowdon attracts a lot of first-time visitors and is in constant use during holiday and weekend periods, while venturing into the lower and less rugged mountains outside the three main areas will mean meeting only a handful of people.