Outdoor swimming at Hovden. Along the river Otra, there are many idyllic places to swim or sunbathe. Find your own spot, away from other people. Swimming is great at Hegni. On nice summer days, water temperatures in the lake of Hartevatn reach 20 C and above, and the beach is teeming with people. Ice cream, lemonade, etc. are available from the kiosk. This superb recreational area has walking paths, play facilities, trampoline and a beach volleyball court, as well as boats and canoes for hire.