I read it off the map. In the park, you have a lake by the graveyard (that's probably the thing with the ducks), then you have the reservoir there, which is drained for the winter. And the last one is the lake where your photo is from. According to the map, it is called "Ornamental Lake".
That’s a lot of detail you can read from that map! 😁
Just noticed I received the transfer from you, thank you so much. Will try to post something this week too ☺️
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The maps on the Czech mapy.cz server are very detailed :-).
I look forward to your next "invitation" :-)