The Kanda river crosses Tokyo over a length of 24.6 km, until it merges into the Sumida River, and it was used both as water supply and as transportation route.
Photographed here is one of the notable locations along the Kanda river, called Ochanomizu, which means "tea water". The name comes from the fact that here was the source of water used by the Edo Castle to prepare the shogun's tea.
EXIF info:
Nikon D90
Lens: VR 18-55mm F/3.5-5.6G
Focal Length: 26mm
Aperture: F/5.6
Shutter Speed: 1/125s
ISO Sensitivity: ISO 200