This Envisat image captures a depression, or low pressure system, covering most of the North Sea, an arm of the Atlantic Ocean, on Monday 2 November 2009. The area of low pressure developed to the southwest of Britain on Saturday night. Heavy rains spread through England (visible), Wales (partly visible), Northern Ireland and Scotland (partly visible) on Sunday morning. The various colours of green visible in the sea around the River Thames in England are due to sediments being transported in the water. Western France is visible in the bottom right.