Olstappen is a lake in Nord-Fron Municipality in Innlandet county, Norway. The southeastern shore of the lake forms the municipal border with Sør-Fron Municipality. The lies about south of the village of SkÃÂ¥bu.
The Vinstra river, coming from the southwest, flows into the west side of Olstappen and flows out of Olstappen's northeast corner, and from there it heads east into the GudbrandsdalslÃÂ¥gen river at the town of Vinstra. The Espa River flows into Olstappen from the south, making it a tributary of the Vinstra.