High Coast/Kvarken Archipelago, Sweden/Finland
This archipelago is located in the Gulf of Bothnia between Sweden and central Finland, and the core protected area covers 1,944 km2. The Gulf of Bothnia extends northward from the Baltic Sea. The Kvarken Islands (Finland) is a group of 5,600 islands. The main geomorphological feature is the De Greer hailstone, which formed from the melting of the continental ice sheet 24,000 to 10,000 years ago. The theory of glacial isostacy states that land that subsides due to the weight of glaciers will rise again after the glaciers retreat. Due to this process, numerous islands have emerged, and they continue to grow larger due to the ongoing uplift. The peninsula has thus continued to expand, and some areas of the sea have evolved into lakes. Since the last glaciers retreated 9,600 years ago, the High Coast has rebounded by 294 m, which the world’s largest amount of glacial rebound.