&bu1=Water channel in Hanoi. (photo: C. Stefan/TU Dresden)&
&bu2=Outskirts of Hanoi. (photo: C. Stefan/TU Dresden)&
&bu3=Densely populated residential area in the Long Bien District, Hanoi. (photo: C. Stefan/TU Dresden)&
&bu4=The Red River during the dry season. (photo: C. Stefan/TU Dresden)&
&bu5=Open sewer channel (Long Bien District, Hanoi). (photo: C. Stefan/TU Dresden)&
&bu6=Ditch between two urban districts. (photo: C. Stefan/TU Dresden)&