Þórdalsheiðarvegur

A steep, narrow power-line service road in East Iceland, with no water crossings on record.

Industrial in purpose — it exists to service a power line, not for sightseeing, though the surrounding terrain is still highland scenery.

The power line it runs beside carries electricity to an aluminum smelter — a functional reason for the road's existence.

No rivers are noted, so the main hazard is the steep, narrow surface itself — treat blind corners and steep grades with the same caution you'd use for any mountain track.