The scenic 232 km long Diamond Ring Road (also known as The Diamond Circle), is a mix of paved and unpaved route with a beautiful scenario, and a popular tourist route in North Iceland.jalvegur. |. Kjalvegur (officially known as Route F35) is a highland road in Iceland, with a length of 168 km (104 mi), crossing Kjoelur, kjÃ¶lur a plateau in the highlands Of, iceland at an elevation of aboutâ600 700, metres from north to. south