Wild Kingdom play area opened on 24 September, at Three Mills Green in Stratford and was designed to allow children to create their own playground from the natural surroundings.
"Carefully placed fallen trees, nets and ropes provide climbing frames and swings, while giant tree stumps, branches and hammocks provide the tools to build dens," said a spokeswoman for the London Legacy Development Corporation, which commissioned the landscape.
The £123,000 play area has more traditional play equipment including a maypole swing and trampoline but with a natural twist, said the Lee Valley Regional Park and charity the Legacy List, which co-commissioned the space.
The scheme was designed by architectural practice We Made That and contractors Free Play following an international competition. The Landscape Group took two months to build the landscape as part of a wider programme of improvements at Three Mills Green in Bow.
London Legacy Development Corporation interim chief executive Dennis Hone said: "We are delighted to open the first legacy project post-Games. It’s going to be an exciting 12 months as we get the Olympic site ready to open as Queen Elizabeth Olympic Park.
"People in Newham and the neighbouring boroughs can expect similarly excellent facilities when the first phase of the Park opens on the 27th July 2013, exactly one year after the opening ceremony of the Olympic Games."
Valley Regional Park Authority vice chairman Michael Rye said: "Wild Kingdom is part of our commitment to working with partner organisations to deliver a tangible legacy from the Games. We are confident t will be one of many legacy benefits for local communities."