Route 1 is a national road in Iceland that runs around the island and connects most of the inhabited parts of the country.
The total length of the road is 1,332 kilometres (828 mi).
The ring was completed in 1974, coinciding with the 1100th anniversary of the country's settlement.
This occurred when the longest bridge in Iceland, crossing the Skeišarį river in the southeast, was opened.
For almost all its length, the road is paved and is two lanes wide: one lane going in each direction.
Where it passes through larger towns, the number of lanes may be increased.
Many smaller bridges are single lane, specially in eastern Iceland, and constructed of wood and/or steel.
There are still stretches in eastern Iceland with an unpaved gravel surface.