Maintaining an 8 km outdoor ice rink

[Query]

https://www.youtube.com/watch?v=oOop5qYniJw

[Bill_S]

Skating the Rideau Canal is on my bucket list. I didn't realize that they maintained the ice so carefully.

[Query]

If you look for "biggest ice rink" on a search engine, a lot of people and places claim they have it.

E.g.,

https://www.npr.org/2018/01/02/575028113/moscow-boasts-that-it-has-the-worlds-biggest-ice-rink
  https://www.youtube.com/watch?v=zl17yGW8B-w

https://www.reddeeradvocate.com/uncategorized/the-biggest-ice-rink-in-the-world/

etc.

...