Ridderspranget means "the Knight's Leap" and is a narrow gorge on the Sjoa river. The river has carved deep into the bedrock here, creating a canyon about 8 metres deep and only 2.5 metres wide at its narrowest point. You can see the emerald glacial water forcing its way through, with wild rapids, potholes worn into the rock, and smooth formations shaped over thousands of years.
The name comes from a medieval legend. In the 14th century, a knight named Sigvat på Kvie from Valdres fell in love with a girl called Skårvangs-sole who was promised to another man, Iva Gjæsling of Sandbu farm in Vågå. One night Sigvat rode to the farm, took the girl, set fire to the buildings, and fled. Pursued by Iva, they reached this gorge with no way across. So Sigvat jumped it on horseback with the girl in his arms. Do not attempt to recreate that.
The area is now a nature reserve. There's a car park with toilets, picnic tables, and information boards about the legend. From there it's a short walk to the main viewpoint where there are railings, though the rocks can be slippery when wet. If you want a longer walk, there's a loop trail of about 4 kilometres that takes around an hour to an hour and a half.
You'll find it signposted off Road 51, about 5 kilometres south of Randsverk. A 1 kilometre side road leads down to the car park.