This is a beach access: 25 steps of natural stone with wooden railing. Please note that the steps are parallel to the promenade, my GPS is somewhat inaccurate.

via StreetComplete 59.1

Attached photo(s):
https://westnordost.de/p/247082.jpg

GPS Trace: https://www.openstreetmap.org/user/Last%20AI%20Survivor/traces/11485944
