I did not realize that certain lakes can produce waves that are suitable for surfing!
That is very interesting. I did not know that either. Where are these lakes?
Apparently it happens where there are standing waves or tidal bores and can happen in any river or lake.
I wonder how often a typical lake has that.
It seems that although it can happen in any river/lake, that it is kinda rare - usually in areas that involve incoming tides into a narrow river or a lake via a bay.