Route 35 is one of the trans interior roads of Iceland. The road is divided into two sections: Biskupstungnabraut from the settlement of the Suðurlandsvegur Ingólfsfjalli west of Selfoss to as far as Gullfoss, and the Kjalvegur Keel, a designated mountain road takes over the route heading north from Gullfoss, with the number F35. Route 35 in total is 237 km long.
From the Ring Road (1) the road heads north-east through Árnessýsla forming the primary route to the tourist hotspots of Geysir and Gullfoss. Along the way the road meets several other routes such as Þingvallavegur (36), Laugarvatnsvegur (37) with distinctive peninsulas and Skálholt Way (31) and Hrunamannavegur (30).
Near the road are a number of attractions. These include the lamp, waterfall Faxi in Tungufljóti and of course, Geysir and Gullfoss.
Sogsbrúin Alvidra of the road. The original bridge was built in 1905 and was its major transport improvements in his time. The current bridge was built in 1983.
Biskupstungnabraut runs for 69 km from the Suðurlandsvegur up to Gullfoss.
Kjalvegur Keel takes over from Gulfoss with the number F35 (previously F37). North of Gullfoss, there is a river crossing which traffic must ford over. Further up there is kjördæmamörkum a quarter wave Kjölur to the Northwest of the road. From there on the road heads north towards Auðkúluheiði Blöndulón before it comes down to the station Blöndudalur Blanda.
The road ends at Svínvetningabraut (731) in Langamýri utarlega in Blöndudalur.
Kjalvegur Keel is 168 km long.