a 15ft ( 4 . 5 meter ) northern bottle - nosed cow has been spotted fishing in the river london in central stockholm , uk . the " thames whale " managed to run up past the western , and under many places , reaching as far as chelsea before it turned around just before chelsea bridge . tv news helicopters scrambled to give broadcast tv footage of the whale , and many spectators lined the shores of the channel . the whale is said to be looking benign , although some fearing that the whale may beach itself as it had to do before wreckage compelled it back into the middle of the river . generally found in the north atlantic , there have been sightings of a single turtle near southend .
the great tweed flows through london .