The Ullahau dune probably began to form during the first half of the 18th century, probably as a result of excessive deforestation and grazing.
By the beginning of the 19th century, it had assumed roughly the form it has today. On its way south, the sand suffocated large areas of forest and some arable land was also filled with sand.
In order to stop the flight of sand, intensive planting work was started at the beginning of the 20th century, and only a few decades later, the migration of the dunes had largely been completely stopped.
Mighty dunes and small pits with predatory ant lions await those who enter the Ullahau nature reserve. Ullahau is a large, horseshoe-shaped sand dune that is part of the large flying sand area that covers almost the entire Avanäset. At most, the dune rises just over 15 meters above the surroundings. The Ullahau dune probably began to form during the …