The highest point on Råda Ås is 90 metres above sea level. The ridge was formed at the leading edge of the last inland ice sheet, about 12,500 years ago. The inland ice is like a giant conveyor belt that grinds the surface beneath it and carries along stone and gravel. It then deposits this stone in large quantities ahead of the ice sheet, forming what we know as a terminal moraine.
The last ice age reached its maximum extent about 20,000 years ago. Then the climate became warmer and the ice began to melt. But for a period, starting about 12,800 years ago, something happened to the climate and it became colder again. This caused the ice to stop melting, and in fact it even advanced in some areas. The result was the central Swedish terminal moraine zone, of which Råda Ås is part. Gravel from the ridge has always been an important resource for people, and we can see several remains of old gravel pits. Gravel is still extracted from Råda Ås today.