The Aar looks like a small, independent river. In reality, it is a branch of the Ill at the heart of a vast urban and Rhine hydraulic system. The bends you use as landmarks are also places where the water sorts speed, sediment and shelter.
The Aar is a diffluence
A confluence brings two bodies of water together. A diffluence does the opposite: one watercourse splits into several branches. At the tip of île Sainte-Hélène, near Saint-Paul, the Aar branches away from the Ill. Showing the start of each branch on the map is not decorative: it is the true geography of the place.
Why 1 hr 10 mins out and 50 mins back?
From the wash house towards Saint-Paul, you paddle against a gentle but continuous current. Every stroke gains ground against the water. After turning beneath bridge 9, the same current gives you a small speed boost.
- On the inside of a bend, the water is often calmer.
- On the outside, it may speed up and erode the bank more deeply.
- Behind a pier or branch, an eddy creates a resting zone.
A regulated river
The Aar’s peaceful appearance is not entirely natural. Along with the barrage à aiguilles de la Robertsau (Robertsau needle weir), the barrage de l’Aar helps maintain the water level in central Strasbourg, the canal de la Marne au Rhin and the port basins.
Further on, the Ill and the Rhine can also exchange water during floods or low-water periods. Your 5 km loop is therefore part of a mechanism far larger than itself.
Another river beneath the river
At Wacken, the Aar exchanges water with the subsoil and replenishes the water table. Beneath the kayak, water does not simply flow downstream: part of the story unfolds vertically, through the riverbed materials.
Worth filming: a fixed shot of drifting leaves followed by a superimposed “surface / underground” animation would make this phenomenon instantly clear.
Nature’s gentle motorway
The water, banks and foliage form a green and blue network. It allows species to move, feed, rest and reproduce. Connected waterways also support water quality and help regulate flooding.
Why “La Petite Amazonie” works
The nickname is poetic, not geographical. The Rhine’s alluvial forests are sometimes described as “temperate jungles” for their richness and abundance. Here, the Aar offers an urban, miniature and highly photogenic echo of them.
Yet this is neither primeval forest nor a nature reserve: the river is channelled and regulated, and its ecological quality still has room to improve. The scenery is spectacular; the reality is more interesting still.
From the reeds to the giant of Contades
What has been documented around the route
La Berge des roseaux lives up to its name. Remnants of alder woodland and relics of Rhine forest survive at Wacken. Further on, Parc du Contades hides a remarkable plane tree about 40 metres tall—far above paddle height.
The next photography mission
Black alder, white willow, black poplar, yellow flag iris, purple loosestrife and water mint all belong to the Rhine’s alluvial habitats. Before presenting them as “plants of the Aar”, they need to be photographed on site: a wide view, leaf, flower and bark.