Mount Sidley is the highest point of the Mary Bird Land.
It is officially recognized as the highest volcano of Antarctica and is one of the “Seven Volcanic Summits”.
Romania 2011, Crina "Coco" Popescu, Stationery Envelope.
The imprinted stamp depicts Mt. Sidley.
After successfully finalizing the expedition "Antarctica 2010-2011", Crina "Coco" Popescu became the first alpinist in the world who climbed the 7 highest volcanoes on the 7 continents: - Elbrus -- Europe, Kilimanjaro -- Africa, Damavand -- Asia, Giluwe -- Oceania, Ojos del Salado -- South America, Pico de Orizaba -- North America, Sidley -- Antarctica.
The 16 years old Romanian alpinist, representative of Romanian Alpinism and Escalade Federation, Crina "Coco" Popescu is also the first alpinist in the world who climbed Mount Sidley in Antarctica (with Alex Abramov, Mario Trimeri and Scott Woolams).