I very much wanted to see this place in the daytime and thanks to my son I got to revisit the place. This is Hammarmölledamm by Hovdala castle where the bats fly by night. The posting on the pond by night can be found here. Fifteen of the nineteen species of bats that exists in Sweden can be found in the woods around Hovdala. More picture of reflections on Weekend Reflections.
If you come to southern Sweden next summer the bat guide can be found on facebook at https://www.facebook.com/bokskogslopare. To see a film with the bats in the pond have a look on Youtube below