That day, no one goes ashore, and yet it's one of the most memorable days of the cruise. The Kiel Canal, which the Germans call the Nord-Ostsee-Kanal, links the North Sea to the Baltic over 98 km through the countryside of Schleswig-Holstein. The ship slips into it through the locks at Brunsbüttel, near the mouth of the Elbe, and doesn't emerge again until Holtenau, on the outskirts of Kiel. In between, hours of peaceful sailing through meadows, so close to the banks that you could almost wave to passersby by hand.

A Shortcut More Than a Century Old

Opened in 1895 under the name Kaiser Wilhelm Canal, this waterway spares seagoing vessels the long detour around the tip of Denmark, roughly 460 km of often rough waters. Imperial Germany saw it as a strategic passage for its fleet; trade has since made it one of the busiest artificial waterways in the world. Cargo ships, container ships and sailboats cross paths here in a continuous line, turning every transit into a permanent naval parade, best enjoyed from the comfort of a deck chair.

Passing Through the Locks

Everything begins and ends with a lock. At both Brunsbüttel and Holtenau, the ship slowly enters a chamber of colossal dimensions, the gates close, the water rises or falls by a few metres, and the mooring lines creak gently against the bollards. The precisely choreographed manoeuvre is best savoured from the ship's upper decks: you look down on the service quays, the lock keepers' bicycles and the small boats that sometimes share the chamber with the steel giants. Early risers often catch the entry into the first lock at daybreak, when mist still lingers over the Elbe.

A Landscape at Pasture Level

Along the route, the appeal lies in its simplicity: peaceful cows grazing by the water, tile-roofed farmhouses, village church spires, cyclists following the convoy along the towpaths, and children waving from the shore. A series of road and rail viaducts span the channel, and passing beneath each one brings its own thrill: the smokestacks seem to brush the steel, and everyone looks up at the same moment. Small ferries, free of charge since the waterway first opened, slip between the convoys to connect the two banks, keeping alive a promise made to local residents in the nineteenth century.

Rendsburg and Its Flying Ferry

The most anticipated moment of the transit comes at Rendsburg, roughly halfway along. There, a 1913 railway viaduct crosses the channel more than 40 m above the water, and beneath its deck runs a world-famous curiosity: a suspended ferry, hung from the structure by cables, that carries pedestrians and cars from one bank to the other as it glides above the water. Watching this aerial transporter cross paths with a container ship sums up the slightly eccentric genius of this whole structure.

Making the Most of Your Transit Day

• Claim a spot outside early: the best viewing places fill up fast when the ship passes through the locks.
• Bring binoculars to pick out villages, birds and the lock keepers at work.
• Check the onboard program: many cruise lines offer live commentary during the crossing.

When the Baltic Opens Up

By the end of the day, the gates at Holtenau swing open and the Kiel Förde comes into view, dotted with white sails. You leave this ribbon of fresh water with the feeling of having crossed Germany through its secret garden, at the pace of another century. Many passengers, closing their travel journal, note that their best day at sea actually happened in the middle of the cows.