each area is subdivided into sectors, and each sector is split up into numbered routes. So, for example, route SAN 1-1-7 corresponds to the following: Santorini area 1 (Kamari), sector 1, route 7. At the beginning of each route, there is an informative sign with data and a grade. This is the climbing field in Perissa, by the church of the Virgin Mary (Panagia) Katefiani. The best times for climbing in Santorini are spring, fall, and winter. "