The shell banks at Kuröd, a few kilometres south of Uddevalla, are a geological curiosity: a large deposit of ancient oyster shells left behind by post-Ice Age seas. When the last glaciers retreated, sea levels were much higher than today and the Baltic-Atlantic coastline ran across what is now inland Sweden. As the land gradually rebounded from the weight of the ice, the sea withdrew and left these shell midden deposits far from any current shore.
The site is pleasant to walk and makes an unusual half-day excursion from town. Interpretive signs explain the geological history. It is also a favourite school trip destination, though the shells themselves are the main attraction.