from the tribune de Genève.

Just to mention : Pregny-Chambesy beach is only for those who live there,

and Onu's beach is private.

There's several things that are forbidden, like swimming near boats, jumping from bridges, swim from Mont-blanc bridge to Sous-terre bidge.

the area where the Rhone and the Arve get together is dangerous.

In the Rade (harbor) and to Cologny's quai, you only can use the public bath.

Perle-du-lac is also forbidden due to waterskiing area.

(from the article)