The Maelbeek or Maalbeek is a stream that runs through several municipalities in Brussels, including Etterbeek, Ixelles, St-Josse-ten-Noode, Schaerbeek. It is a tributary of the Zenne, which it joins in Schaerbeek, and its source is located near the Abbey of La Cambre. It was vaulted in 1872, at which time there were 58 ponds along the stream.