Former US president Barack Obama delivered a speech to a crowd of 15,000 people in Johannesburg on Tuesday to mark Nelson Mandela's birthday.

The former US President delivered the Nelson Mandela Annual Lecture at Wanderers stadium in the course of which he urged young people to fight to defend democracy, human rights and peace.

Tuesday's speech comes on the eve of "Mandela Day" his birthday, which is marked around the world every year on July 18.

Mandela died in 2013 but five years later, his legacy still speaks huge for him particularly for his long struggle against white-minority apartheid rule and for his message of peace and reconciliation after being freed following 27 years in prison.

Obama met Mandela only briefly in 2005 but gave a eulogy at his funeral saying Mandela "makes me want to be a better man" and hailing him as "the last great liberator of the 20th century".
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