10 most difficult Russia riddles

The word mammoth comes from the mythology of the Siberian peoples who believed they lived underground - as dead ones were found in the ground from time to time.

Argentina maintains the most permanent polar stations - 6, Chile - 5, Russia - 5.

Russia's neighbours are: Norway, Finland, Estonia, Latvia, Belarus, Ukraine, Georgia, Azerbaijan, Kazakhstan, China, Mongolia, North Korea, Lithuania and Poland.

Baron Pyotr Nikolayevich Wrangel (1878-1928) was a Russian officer in the Imperial Russian Army and later commanding general of the anti-Bolshevik White Army in Southern Russia in the later stages of the Russian Civil War. After his side lost the civil war in 1920, he left Russia and became one of the most prominent exiled White émigrés.Wrangel is immortalized by the nickname of "Black Baron" in the marching song The Red Army .

Vistula is the longest of the Baltic Sea affluents, but its mean discharge of 1080 m3/s is less than half of Neva (2500 m3/s). Other major Baltic Sea effluents are Daugawa nad Neman (both 678 m3/s).

The Lena is the easternmost of the three great Siberian rivers that flow into the Arctic Ocean (the other two being the Ob and the Yenisei). It is the 11th longest river in the world and has the 9th largest catchment area. It is also the 3rd largest river in Asia. It is the largest among the rivers whose catchment is entirely within the Russian territorial boundaries.

Wladivostok is a city and the administrative centre of Far Eastern Federal District and Primorsky Krai, Russia, located around the Golden Horn Bay, not far from Russia's borders with China and North Korea. The city is the home port of the Russian Pacific Fleet and the largest Russian port on the Pacific Ocean.

The Caspian Sea, fed by freshwater (sweet) rivers, mainly Volga (80%) and Ural in the north, is freshwater, while it's deeper, warmer and saline (1.2%) in the south. The salinity of Garabogazköl, shallow eastern bay is 35%!

The word "ruble" comes from the verb meaning "break" and refers to the Middle Ages, when pieces of silver were broken into smaller ones when changing money. The ruble was the world's first decimal currency: it was decimalised in 1704 when the ruble became legally equal to 100 kopeks.

Dmitriy Donskoy (TK-208) is a Russian Navy nuclear ballistic missile submarine, designated Project 941 Akula class (NATO reporting name Typhoon). With the decommissioning and scrapping of her Typhoon sister boats (TK-202, TK-13, Simbirsk, Arkhangelsk, Severstal, and TK-210), she is the largest submarine in the world in active service.