We plunge into the icy waters of the Russian Arctic for today's geo-quiz. Our destination is a mountainous island - much of it covered in glaciers. It's the southernmost island of the North Land group.

Explorers had such a tough time navigating in these often ice-bound waters that detailed maps weren't available until the 1930s. The island we've got in our sights now is just off the Taymyr Peninsula on the Arctic coast of Siberia.

Some Russians would like to rename the island. Perhaps they're not so nostalgic for the Soviet days. Here's a big hint: the island is named after the faction that seized power in Russia during the October Revolution.

These days you might hitch a ride to the island on a submarine. Do you have it in your periscope now, comrade?