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How to use this Guide

To sum up, the structure of each of the chapters covering the 21 mountain groups is as follows:

 List of the peaks and lakes in the group

 Diagrammatic map

 General overview

 Main ways up each of the peaks

 High-level walks

 Lower-level walks

 Walks for easier days

All routes are numbered. Each number begins with a two-letter prefix to identify the mountain group concerned (eg RG stands for the Rhinogs). The main routes are then numbered sequentially (eg RG1, RG2, and so on). Localised variations within routes are distinguished by numeric suffixes (eg RG2,1). High-level and lower-level/easy day walks are given H and L designators respectively after the mountain group code (eg in the case of the Rhinogs high-level walks are numbered RG H1, RG H2 etc).

The maps are diagrammatic and should not be regarded as a substitute for the proper OS map. Their purpose is to show the relationships between the various routes in the simplest and most uncluttered way. Details of towns, roads, streams and so on are therefore only shown where needed to give a general sense of location, and are not necessarily consistent between one map and another. To avoid congestion only the main ways up each peak are shown. The other walks are not marked, nor are the local variations indicated by numeric suffixes to their route numbers.