It adjoins Sunbury-on-Thames in Surrey, England on the Middlesex (northern) bank of the river.

The Middlesex bank is quite open with several larger houses along it until Dumsey Meadow a Site of Special Scientific Interest.

About half a mile above the lock is Trowlock Island close to the Middlesex bank, followed by Steven's Eyot in the centre of the river.

The water between the island and the Middlesex bank is shallow, but navigable with care to small vessels.

The lock was opened in 1813 with the lock-house effectively on the Middlesex bank (although technically in Surrey because the course of the stream had been altered.

The Middlesex bank has gravel pits out of sight and then park land until it reaches Laleham, where there are riverside houses.

The Thames Path follows the Middlesex bank all the way to Penton Hook lock.

Isleworth was a well established riverside settlement on the Middlesex bank of the River Thames at the time of the Norman Conquest in 1066.

The Middlesex bank has interesting features like the Swiss Cottage and the Astoria Houseboat and there is then an array of period buildings at Hampton.

There is a suspension bridge to the island from the Middlesex bank at Hampton.