Is this a picture of a lake or the sea?
The reason I ask is that the shoreline looks more like a fresh water shore than a salt water shoreline.
Vegetation too close to the water line, no beach, and mangrove trees do not appear in Europe.
Certainly looks like an inland fresh water lake or river. But it could just as easily be inland salt water. Bay, or fjord. Isn’t that area known for its fjords?
Mangrove? I don’t know where you came up with that. It looks just like Puget Sound. Salt water...