On the course we have marked areas where giant potholes or "Jättegrytor" were formed during the ice age. This was caused when a stone was caught in a pit and meltwater that flowed at high speed caused the stone to start spinning. Along with gravel this ground a deep round hole in the rock. These potholes provide interesting locations for nature to develop.
The name "Jättegrytor" comes from the past when it was thought that giants used the holes to cook their food.