Apart from changes in sea level, sometimes the land is moving up, sometimes down. See for instance the still ongoing rebound of Scandinavia, taking place since

Apart from changes in sea level, sometimes the land is moving up, sometimes down. See for instance the still ongoing rebound of Scandinavia, taking place since the start of the current interglacial period (11,700 years). https://en.wikipedia.org/wiki/Post-glacial_rebound#Vertical_crustal_motion https://en.wikipedia.org/wiki/Post-glacial_rebound#Vertical_...