The Reykjavik Marathon course is about 60% flat and 40% rolling. The total difference in altitude is only about 30 meters. During the first 6 km there are 3 slight hills with elevation of few meters and again around 12 km. After 15 km there is a hill with an elevation of about 10 m, probably the steepest part of the course. From 18 km to 20 km there is a slow elevation of 25m (the highest point of the course). After that there are very slight hills with two exceptions around 26 and 28 km where the elevation is about 6-7 m.
The marathon and the half marathon routes are one lap (except for the last part of the marathon, as it goes nearly the same route as in the beginning of the race). The 10 km route is only the first part of the marathon course (see course map).