"Beach" in Berlin

No, Berlin is not a city by the sea. But yes, we have some beaches and a lot of water (the Spree-river and many lakes). The biggest lakes are Wannsee, Müggelsee and Tegeler See. Today I made a bike tour with my family around the Tegeler See and in the end I sketched the beach in Saatwinkel in the late afternoon sun. It's 20 minutes from my home by bike. We live near the lake.