Marsh Lock is a lock and weir situated on the River Thames, England near Henley-on-Thames in Oxfordshire. The first pound lock was built by the Thames Navigation Commission, way back in 1773. The weir consists of a series of iron watergates running from the lock to the Oxfordshire bank near the mills. It is situated between two walkways. During my visit to Henley during July 2010, I was able to spend a good few hours around the lock and weir. This is a detailed video showing how the boats pass through the lock. Hope you all enjoy this 8 minutes video. For more details please visit: en.wikipedia.org/wiki/Marsh_Lock