What is the name of the largest city in the Arctic Circle?

What is the name of the largest river that flows into the Arctic Ocean? What is the name of the largest lake in Antarctica? 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? Which sea is located between the Svalbard archipelago and the Norwegian mainland in the Arctic? What is the name of the largest glacier in Antarctica? What is the name of the largest ice cap in the Arctic? Which river flows through the Arctic tundra in northern Canada?