The Kvarken Archipelago is the only Finnish natural heritage on UNESCO’s World Heritage List. The nature in the Kvarken archipelago is unique. Ca. 10 000 years ago the low moraine islands of the Kvarken archipelago, which were molded by the retreating, melting ice, were released from the ice masses. After the huge weight of the ice was gone the surface of the earth started to rebound.
The Kvarken Archipelago was marked as a UNESCO World Nature Heritage site in July 2006. It is the first Finnish natural heritage landmark on the list. The low Kvarken archipelago and the high Höga Kusten (High Coast) on the Swedish side are perfect examples of how the rapid land uplifting forms landscape and influences biological processes.