The cache is not located at the above posted coordinates.
In order to find this cache you have to solve the riddle below.
Parking / Waypoints: Waypoints are important for easy access to the final cache. They and also a parking coordinate are available from the geochecker so please use the checker.
Riddle:
N Súgandafjarðarvegur° Þrengslavegur.[Búrfellsvegur + Hryggjavegur]
W [Nesjavallaleið - Bláfjallavegur]° [Vatnaleið - Borgarfjarðarbraut].[Baldursheimsvegur - Landeyjavegur]
Geochecker:

Please be aware that this mystery was created based on information available in English. As - unfortunately - too often, information provided in different languages may have discrepancies.
-- Many thanks to ravestorm and Schlauchen for placing the new box in August 2020 --