In some posts here, it is postulated that similarities can be found between the Strandir area in NW Iceland and the East Fjords. Marking the extinguished volcanic sites of the NW with circles and comparing with the East, it actually fits. Extinguished volcanic sites are found at the same locations, at first sight beyond sheer coincidence.
The parallel origin of these areas seems to lead to a similar distribution of volcanic sites. This is by no means a thorough comparison, as this is just to point out an idea for those interested in geoscience to compare those areas.