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The River Lea (or Lee) originates at Marsh Farm Leagrave, Luton in the Chiltern Hills and flows generally southeast, east, and then south to London where it meets the River Thames. The river is 42 miles long.
Wikipedia: Link

This is a sporting complex is being used for the 2012 Summer Olympics and the 2012 Summer Paralympics, situated to the east of the city adjacent to the Stratford City development. It contains the athletes' Olympic Village and several of the sporting venues including the Olympic Stadium and Aquatics Centre. The park is overlooked by ArcelorMittal Orbit, an observation tower and Britain's largest piece of public art. After the Olympics, the park will be known as Queen Elizabeth Olympic Park, to commemorate the Diamond Jubilee of Elizabeth II.
See Link for more details on the various parts of the park.

The ArcelorMittal Orbit is a 115-metre-high (377 ft) observation tower in the Olympic Park in Stratford, London. The steel sculpture is Britain's largest piece of public art,[3] and is intended to be a permanent, lasting legacy of London's hosting of the 2012 Summer Olympics, assisting in the post-Olympics regeneration of the Stratford area. Sited between the Olympic Stadium and the Aquatics Centre, it allows visitors to view the whole Olympic Park from two observation platforms.
See Link for more details on the tower/sculpture

Orbit was designed by Anish Kapoor and Cecil Balmond