An annual marathon that runs along the seaside of Oslofjord. It is very flat, and competitors in the marathon run the course twice. There is a choice of distances: marathon, half-marathon and 10k, and also the Oslo triple - a 73k run where you run the combined marathon, half marathon and 10k, which means you must finish the marathon in time to start the half marathon before the last group for this distance starts, and finish the half marathon in time to start the 10k before the last group for this distance starts. Also children's events.
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