What is the name of the largest lake in Antarctica?

Which research station on the Antarctic continent is operated by Russia? Which country has the most territory within the Arctic Circle? Which country has a territory that includes the northernmost point of land on Earth? What is the name of the largest river that flows into the Arctic Ocean? What is the name of the strait that separates South America from Antarctica? Which of the following countries has a coastline on the Arctic Ocean? What is the name of the largest city in the Arctic Circle? Which sea is located between the Svalbard archipelago and the Norwegian mainland in the Arctic?