When River Allier gets navigable as from Celle, it already has a long way behind it. Its spring is in the west of Magdeburg at Saxony-Anhalt then it passes Wolfsburg through the southern heath lands and flows into the Weser at Verden.
River Aller has its source westerly of Magdeburg in Saxony-Anhalt. It passes Wolfsburg and through the southerly heath where it flows into the Weser after Verden. It is conditionally navigable from the very beautiful town of Celle. At the highest navigable water level, one has to be very careful since the head room is then 2.60 m only.
all european waterways, die Nr. 1 für Hausboot und Hausbooturlaub in Deutschland und Europa.