We went swimming at Lake Beli Kamen.
45.10553, 19.710479
From Novi Sad, it’s an hour’s drive along winding roads over Fruška Gora.
You can drive almost all the way to the lake. There are many cars parked, but there’s still space to find a spot.
It used to be a quarry, so the bottom is covered with pebbles.
There are no trees, so there's no shade from the sun. We brought an IKEA tent, took turns changing inside it, and sat in its shade.
The links provide descriptions of other lakes as well: one, two,