The Senne used, indeed, to flow through the centre of Brussels and was navigable at least as far as St-Géry, which was actually an island in the river. Bringing boats into the city can’t have been much fun, though, because the Senne was also Brussels’ sewer. In fact it was so ghastly that Brussels’ mayor between 1863-1879, Jules Anspach, conceived the idea of covering it over and building on top of it the grand boulevards which cross the city.
In the 1930s, the underground river was diverted to follow mpre or less the course of the ‘petite ceinture’ between Midi and Yser and the old tunnels through the centre used as the basis for the 1976 cross-town pre-Metro through Bourse and De Brouckere.
Consequently, there are only two places within the Brussels city limits where you can see the Senne. One short section is in the Poxcat area of Anderlecht and the other is the last 500m or so of the river before it exits Brussels and enters Vilvoorde.
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