The route is divided into 24 sections in three groups: the "blue" group in South London, the "green" group in north-west London, and the "yellow" group in north-east London. Each of the 24 sections links public transport nodes, though they vary greatly in length, from section 14 to section 16. The guidebook by David Sharp adds together some of the shorter walks among the 24 to give 15 approximately equal stages, designed to be day walks. The table below shows the correspondence between the official sections and Sharp's sometimes longer walks.