The arm branches off from the grand union canal at marsworth, near the tring reservoirs, less than a mile from the start of the wendover arm, and heads west for six and a quarter miles to the county town of buckinghamshire. Once in aylesbury you can visit the towns impressive new theatre, take advantage of the many eating and drinking options or visit the towns county museum and roald dahl. A map of the aylesbury arm of the grand union canal the map displays a range of services available on the aylesbury arm of the grand union canal. Simply click the box next to any service being displayed in the map key on the left of your screen. Information and photos about the towpath, walks, bridges, feaures and locks on the aylesbury arm of the grand union canal in england. The aylesbury arm starts off from the grand union canal at marsworth junction (at the canal bridge along watery lane hp23 4ly i. Close to the b489) and runs for 10 kilometres across the countryside to arrive in the centre of aylesbury in buckinghamshire. The canal was built at the end of the 18th and beginning of the 19th centuries, providing a more direct route between the 2 cities. The aylesbury arm was opened in 1814 linking aylesbury with the grand union canal at startops end (pronounced starrups) near marsworth. Originally planned to carry onto the thames at abingdon, the new canal was to be known as the western junction unfortunately, so strong was the opposition from landowners that the route west of. The grand union canal (grand junction canal - aylesbury arm) is a narrow canal and is part of the grand union canal (grand junction canal). It runs for 6 miles and furlongs through 16 locks from marsworth junction (where it joins the grand union canal (grand junction canal - main line - gayton to brentford)) to aylesbury basin visitor moorings (which is a dead end). Tring reservoirs supply water to the grand union canal and its two arms to wendover and aylesbury. The clear water attracts lots of plants, fish and insects, and large numbers of breeding, wintering and migrating birds. The grand union canal in england is part of the british canal system. Its main line starts in london and ends in birmingham, stretching for 137 miles (220 km) with 166 locks. It has arms to places including leicester, slough, aylesbury, wendover and northampton. The grand union canal was also the original name for part of what is now part of the leicester line of the modern grand union this.