Located on the border between South Karelia and South Savo, the Ruuhonsaari islands are the nobility of the esker islands of Saimaa. They are part of the esker conservation program and form a Natura 2000 site. In the deep lagoon of the Taka-Ruuho, shaped by the continental ice sheet, the steep slope continues far below the surface of the water, reflecting the shape of an ice mass. It is therefore possible to moor with large boats.