TIL that Mashu lake in #Hokkaido is technically not a lake. There are no rivers flowing in or out of the basin; this, in japanese, makes it a 水溜り - a puddle.

The takeaway is that words and definitions are a map or a model of reality, not reality itself.

But also that you shouldn't let that stop you from having fun with words every chance you get.

E: the discussion page on Wikipedia for reference: https://ja.wikipedia.org/wiki/%E3%83%8E%E3%83%BC%E3%83%88:%E6%91%A9%E5%91%A8%E6%B9%96