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The Aylesbury Arm is a branch of the Grand Union Canal (originally the Grand Junction Canal) and the Act authorizing its construction was passed in 1794, and there were plans (never implemented) to extend the Arm to the River Thames at Abingdon. Construction started in 1811 and it was opened in 1815, and has been open ever since. It was used to ship grain, coal, timber and building materials until the 1960's. It is now provides a pleasant route through the Aylesbury Vale and is much used for walking, boating and fishing. There is also a working boatyard.
The Arm is 6¼ miles long, has 16 locks and rises 95 feet between Aylesbury and Marsworth. Unlike the Grand Junction Canal and the nearby Wendover Arm, which weave across the countryside making the most of the contours, the Aylesbury Arm is remarkably straight, reflecting the level nature of the Vale of Aylesbury. The locks will only take a single narrowboat, in contrast to the main canal, which will take two – or one full width barge.