Källtorp spontaneous nude beach is located at the Lake Källtorp in Nacka, straight across the lake from the farm Källtorp.
There is a bus from Slussen to the stop "Snörom". It is about 5 min walk to the right along the lake. Study the map on page 45 G1 in the phone directory.
It is also possible to park you car a little north of the farm Källtorp.
Rocky beach which is not very well suited for smaller children. No conveniences like tap water, toilet and dust bin at all.
Links
[1] https://scandinavianaturist.org/en/taxonomy/term/7