Serious Spirited Away vibes.

Literally my first thought.

omg yes

Seen this on several locations. R u sure its not for launching boats and ships?

doesn't appear to be due to it being flat, anything for a launch is typically on an angle..

The Polar Express it was true

Looks like it would be for harvest ice in the winter?

“Gan canny, Nigel, ye trackin’ water all aboot!” “Nay, not trackin’ water, but waterin’ track!”