You can find equivalent distances to the seaports of Hamburg and Szczecin. The latter was "Berlin's port" right until 1945, but Chilly War neglect as well as freshly drawn German-Polish border have all but severed that link. There have been only sluggish attempts within the 2010s and 2020s to re-build https://bbcnewsz.de/rum-tasting-berlin-ein-erlebnis-fur-genieser/