The sea is named after the British sailor James Weddell who entered the sea in 1823 as far as 74° S. It was first widely explored by the ScotWilliam S. Bruce over 1902-04.
It was in this sea that Shackleton's ship, the Endurance was trapped and crushed by ice in 1915.
The ice shelves which used to extend roughly 3900 square miles (10,000 km²) over the Weddell Sea have completely disappeared by 2002.
It is believed that the break-up of Gondwana started in the Weddell Sea.