Which river flows through the Arctic tundra in northern Canada?

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? What is the name of the largest glacier in Antarctica? What is the name of the largest ice cap in the Arctic? Which Antarctic research station is located at the South Pole? What is the name of the strait that separates the Antarctic Peninsula from the South Shetland Islands? Which sea surrounds the northern coast of Greenland? What is the name of the strait that connects the Kara Sea to the Laptev Sea?