to below Windsor. The lock was rebuilt in 1909. Access and location The lock is accessible on foot or bicycle along the towpath from Blacksmiths Lane and its spur Riverside or Penton Hook Road. The lock is against the left bank marking the Church parish medieval border of Laleham and Staines upon Thames in Surrey since at least the Norman Conquest. By boat the lock can be accessed from Thorpe on the right bank. Reach above the lock The river is built up in a range of suburban extents on both sides after the lock and passes through Staines-upon-Thames. On the near bank the 'bungalow town' of Penton Hook or South Staines was in existence by 1919. Between Staines Railway Bridge and Staines Bridge is an open riverside area with pubs on both sides and two of the seven mouths (see distributary) of the River Colne, briefly canalised, join the Thames, the eponymous final arm in the town centre and Sweeps Ditch. In the upper reach on the left bank is a replica of the London Stone placed near here in 1285 to mark the upper limit of the tidal Thames and the jurisdiction of the City of London. Beside it is Church Island and a recreation area. Upstream are Hollyhock Island and its wooded islet Holm Island; where the right bank was a 20th-century industrial area with gas works and water works, redeveloped into business and retail estates. A widened single-span bridge designed by Edwin Lutyens carries the M25 motorway and the A30 across the river downstream of Bell Weir lock. Below the town's rowing club on the Egham side, Staines Regatta takes place at Silvery Sands 1000 yards (900 metres) above the lock in July. Thames Path The Thames Path is on the right bank (that is by convention proceeding downstream) from Bell Weir Lock; at Staines Bridge it crosses to the left bank. See also Locks on the River Thames Rowing on the River Thames External links Penton Hook Lock at the River Thames Guide References Locks on the River Thames