Hurd's Deep

Hurd Deep running from bottom left to top right of an extract from a 1955 Admiralty Chart
1955 Admiralty Chart No 2649 showing Hurd Deep in the context of the English Channel

Hurd's Deep (or Hurd Deep) is an underwater valley in the English Channel, northwest of the Channel Islands. Its maximum depth is about 180 m (590 ft; 98 fathoms), making it the deepest point in the English Channel.