This natural geological site is a group of about 20 cylindrical giant potholes carved into the bedrock by glacial meltwater. The largest, Jättiläisen kuhnepytty, is about 4.2 m wide and 10.3 m deep, and the site is described as the most extensive pothole area in Finland. The potholes are named and marked with name signs and information boards. The site opened to the public in 1965, and eight potholes were protected as natural monuments in 1964.
Walking trails run across the rock area, a scenic trail and forest, about 1.2 to 1.8 km in total. The rock area is reached by a rocky path with iron railings and stairs, and you can also arrive by canoe or boat from the Porvoo River. A mobile guide with route narration works on a phone. There are picnic and barbecue options, and a small contribution at the entrance supports maintenance. The site is maintained by the local heritage association Askola-Seura ry. The car park, entrance and toilet are not wheelchair accessible.
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