Hvalfjarðargöng is a road tunnel under the Hvalfjörður fjord and is the first underwater tunnel in Iceland. It is among the longest underwater road tunnels in the world, being 5,770 m (18,930 ft) in length and of it, 3,750 m (12,303 ft) lies beneath the seabed. Its deepest point reaches 165 m (541 ft) below sea level.

Borgarnes

By the shore of Borgarfjörður fjord is the town Borgarnes. This is the largest town in the Borgarbyggð municipality, with a population of about 2000. Borgarfjarðarbrú bridge, which opened in 1981, is the second-largest bridge in Iceland after Skeiðarárbrú bridge, being 520 m (1,706 ft) in length. This bridge connects the main road between the northern and southern parts of Iceland. Here we will stop for refreshments and restrooms and stretch our legs.