During the Ice Age, formations similar to this 7km-long sand ridge were created all over the country. Because it crosses a large lake, it’s always been an important travel route. Short sections of the original unsealed road along the ridgetop remain – once part of a route to Russia connecting the Olavinlinna and Vyborg (Viipuri) castles. To stroll on the ridge, get off at Retretti train station and walk east towards Punkaharju village, either shadowing the main road, or along the quieter byroad signposted 'Harjualue'. It is a spectacular walk, particularly on a sunny day, with water on both sides. Other labelled trails explore the forested areas from the Arboretum car park, between Lusto and Retretti.
