Part of the Capital Ring circular route round inner London, much of this Guided Walk follows London's second greatest river, the River Lea and the Lee Navigation, joining the river at the Horseshoe Bridge, following the towpath by Walthamstow Marshes and Hackney Marshes and finishing by the Queen Elizabeth Olympic Park near Hackney Wick Station, offering historical and industrial interest as well as wildlife and water, taking in the railway arch where A V Roe in 1909 achieved the first all-British powered flight, the remains of the filter beds that provided drinking water for East London and an outpost of Eton College.