The Two Oceans Marathon is a 56 kilometres (35 mi) ultramarathon and 21 kilometres (13 mi) half-marathon held annually in Cape Town, South Africa on the Saturday(Ultra) and Sunday(Half) the weekend after Easter weekend.(previously was on Easter weekend)

René Kalmer is a South African runner who has competed over distances ranging from 800 metres to the marathon. She represented South Africa at the 2008 Summer Olympics, running in the 1500 metres. She then represented South Africa again at the 2012 Summer Olympics, competing in the marathon.