Submergent coastlines or drowned coastlines are stretches along the coast that have been inundated by the sea by a relative rise in sea levels from either isostacy or eustacy.
Submergent coastline are the opposite of emergent coastlines, which have experienced a relative fall in sea levels.
The High Coast (Swedish: Höga Kusten) is a part of the coast of Sweden on the Gulf of Bothnia, in the Ångermanland province of northeast Sweden, centered in the area of the municipalities of Kramfors, Härnösand and Örnsköldsvik. It is notable as an area for research on post-glacial rebound and eustacy, in which the land rises as the covering glaciers melt, a phenomenon first recognised and studied there. Since the last ice age, the land has risen 300 meters, which accounts for the region's unusually tall cliffs. The High Coast and the Finnish Kvarken constitute the Swedish/Finnish High Coast/Kvarken Archipelago UNESCO World Heritage Site because of its exceptional geology and unique example of isostatic rebound.