If the wound is COMPLETELY closed and healed, and has been for a while, then I would guess you can go into either type of water. But, if the wound is still healing and has opened up on you, I would stay away from lakes and pools. Even though the water may have salt or chlorine in it, there are lots of microbes and other things that could potentially get inside your wound and possibly cause an infection. If you're not sure, I'd wait until the wound was healed and stay healed and closed for a while before getting into water. Then try getting a bath first and see how it goes.