The Dokkumer-Grootdiep is a historic canal waterway in the northeastern corner of Friesland, Netherlands, connecting the town of Dokkum with the broader waterway network of the region. The canal has deep historical roots: in earlier centuries it served as Dokkum's direct link to the open sea via the Lauwerszee, making the town one of the most strategically significant settlements in Friesland. As the canal gradually silted up, Dokkum's prominence declined, and in 1729 the Dokkumer-Grootdiep was sealed off from the Lauwerszee with the construction of a sea lock at Dokkumer Nieuwe Zijlen.

The waterway passes through largely flat, open Frisian countryside, with meadows lining the banks and a generally quiet, rural character. Along the route, paddlers pass the former stone factory at Oostrum, which features a notable chimney and has been designated a national monument, with restoration plans underway as of 2021. Moorings are available along the canal for those traveling by larger vessel, and the town of Dokkum itself offers access to a network of connecting canals including the Zuidergracht, Baantjegracht, and Admiraliteitshaven.

The speed limit on the Dokkumer-Grootdiep is 9 km/h. Paddlers should be aware of a specific hazard at the junction between the Westersingel and the canal Kleindiep in Dokkum, where a gutter presents a significant danger — this passage is explicitly not recommended for inexperienced paddlers, and those with a V-shaped hull kayak are advised to avoid it entirely due to the risk of capsizing.

The Dokkumer-Grootdiep connects to a broader network of routes in the area. A popular day trip of approximately 28.5 km departs from the Klaarkampsterbrug (GPS: N 53.3158, E 5.9350) and incorporates the Grootdiep, Kleindiep, Driepypstergracht, Aalsumervaart, Paezens, and Jellegat canals, with several portages required at locks and weirs along the way. The Strobosser Trekfeart branches off from the Dokkumer-Grootdiep and has a maximum speed limit of 6 km/h with fixed bridges offering a maximum clearance height of 3.00 meters.