Geograph - photograph every grid square

Filance Lock, No 37 on the Staffordshire and Worcestershire Canal, allows a fall of 10ft 3in (3·1 metres) as the navigation descends towards the River Trent at Great Haywood. Narrow locks like this on the inland waterways can accommodate boats with a beam of up to seven feet (2·1 metres) and a length of seventy feet (about 21·3 metres).

The canal was opened in 1772, engineered by James Brindley. It cost a little over £100,000 at the time. The canal links the River Severn at Stourport to the Trent and Mersey Canal at Great Haywood Junction in Staffordshire. There are 43 locks (45 if you don't fancy the deep wide locks at Stourport) and the canal is 46 miles in length.