The De Mas Rocks, also known as Demas Rocks (63°35′S 058°03′W) is a group of rocks off the northwest coast of Trinity Peninsula

Trinity Peninsula

Trinity Peninsula is the extreme northern portion of the Antarctic Peninsula, extending northeastward for about from a line connecting Cape Kjellman and Cape Longing. Dating back more than a century, chartmakers used various names for this portion of the Antarctic peninsula, each name having some...

, Antarctica in the approach to Huon Bay, 3 miles (4.8 km) northeast of Cape Ducorps

Cape Ducorps

Cape Ducorps is a point marking the north end of Cockerell Peninsula on the north coast of Trinity Peninsula. Discovered by a French expedition, 1837–40, under Captain Jules Dumont d'Urville, and named by him for Louis Ducorps, a member of the expedition....

. Discovered in March 1838 by Captain Jules Dumont d'Urville

Jules Dumont d'Urville

Jules Sébastien César Dumont d'Urville was a French explorer, naval officer and rear admiral, who explored the south and western Pacific, Australia, New Zealand and Antarctica.-Childhood:Dumont was born at Condé-sur-Noireau...

, who named the rocks after his Lieutenant François Edmond Eugene de Barlatier de Mas

François Edmond Eugene de Barlatier de Mas

François Edmond Eugène de Barlatier de Mas was a French naval officer, born in 1810 in the Saussay. He was the son of Auguste de Barlatier de Mas 1781-1836 and Sophie Joséphine Archdeacon 1785-1857, and grandson of the Famous Captain Paul François Ignace de Barlatier de Mas who fought in the...

 of the expedition ship Astrolabe

French ship Astrolabe (1817)

The Astrolabe was a horse barge converted to an exploration ship of the French Navy. She is famous for her travels with Jules Dumont d'Urville.The name derives from an early navigational instrument, the astrolabe, a precursor to the sextant.-Legacy:...

. The rocks were surveyed by Falkland Islands Dependencies Survey (FIDS) in 1946.