Reflection of the sky in Lake Nero (#club100)

Hello Friends!!!
Today I want to show a laconic landscape of Lake Nero, which is located near the city of Rostov.
If you are interested, you can see it on the map:
https://goo.gl/maps/E7B3C5MbFodnUZTb8
On the map, you can also see the small island that I have in the photo.
Rostov is an ancient city with a large Kremlin and ancient churches. A lot of tourists come there.

And now let's look at the photo. Right now, when I prepared it for uploading to our community, I saw strange bands of waves that form a lattice. When I used to look at the photos, I didn't notice them, I wasn't attentive to details.
I wonder what it is, because there were no boats nearby, but only one rubber boat with a fisherman, which did not move and could not create waves.
This is some kind of amazing phenomenon. If you can explain it, then write in the comments, it will be interesting!