Welcome to Mývatn to Egilsstaðir
Soon you'll cross the bridge over the glacial river Jökulsá á Fjöllum; Rte 864 is signposted north from just east of the bridge; this rough gravel road is generally open June to October, and arrives at Dettifoss (eastern vantage point) after 31km, and Ásbyrgi after 60km.
From the bridge, the Ring Road takes a short cut inland across the stark highlands of the northeast interior. If you won’t be travelling into the highlands proper, you’ll glimpse their start here. The ostensibly barren, grey-toned landscape is dotted with low hills, small lakes caused by melting snowfields, and wandering streams and rivers.