Dokkum are well preserved and are known as the bolwerken (bulwark )

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Photo credit: © Peter Horree / Alamy / Afripics
License: Licensed
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Keywords: .fortifications, beautiful, boat, boats, bolwerken, dokkum, dutch, fortifications, fortified, friesland, harbor, harbors, motor, port, preserved, sailing, ship, ships, town, vessel, vessels, yachting