The zone is approximately 500m long and 40m wide; it is bounded upstream by the Duke of Northumberland’s River and downstream by the natural riverbank in front of Syon House. There are river stairs to the south east of All Saints Church. These are well maintained, with a handrail but can become slippery at times. The site can also be accessed via the slipway next to the London Apprentice PH. The ground conditions on the site are generally firm on gravels.