The Kvarken Arch­i­pel­ago (Fin­land) and the High Coast (Swe­den) are sit­u­at­ed in the Gulf of Both­nia, a north­ern exten­sion of the Baltic Sea. The 5,600 islands of the Kvarken Arch­i­pel­ago fea­ture unusu­al ridged wash­board moraines, &lsquo,De Geer moraines&rsquo, formed by the melt­ing of the con­ti­nen­tal ice sheet, 10,000 to 24,000 years ago. The Arch­i­pel­ago is con­tin­u­ous­ly ris­ing from the sea in a process of rapid glacio-iso­s­ta­t­ic uplift, where­by the land, pre­vi­ous­ly weighed down under the weight of a glac­i­er, lifts at rates that are among the high­est in the world. As a con­se­quence islands appear and unite, penin­su­las expand, and lakes evolve from bays and devel­op into marsh­es and peat fens. The High Coast has also been large­ly shaped by the com­bined process­es of glacia­tion, glacial retreat and the emer­gence of new land from the sea. Since the last retreat of the ice from the High Coast 9,600 years ago, the uplift has been in the order of 285 m which is the high­est known “rebound“. The site affords out­stand­ing oppor­tu­ni­ties for the under­stand­ing of the impor­tant process­es that formed the glaciat­ed and land uplift areas of the Earth“s sur­face.