10 most difficult Ukraine riddles

The official language of Ukraine is Ukrainian, an East Slavic language which is the native language of 67.5% of Ukraine's population. Russian is the native language of 29.6% of Ukraine's population (mostly urban areas) and the rest (2.9%) are native speakers of other languages.

Zhytomyr is a city in the north of the western half of Ukraine.The Teteriv river generally forms the southern boundary of Zhytomyr, though there are also some small areas of Zhytomyr city territory below the southern bank of the river. Its northern part is contaminated by the Chernobyl power plant.

Mount Hoverla is the highest mountain in Ukraine and part of the Carpathian Mountains. The mountain is located in the Eastern Beskides, in the Chornohora region.

Sea of Azov is a small and shallow sea, sometimes regarded as a northern extension of the Black Sea. Two large rivers, Don and Kuban, flow into it, and so the sea has low salinity and a high amount of biomass (such as green algae) that affects the water colour. It was known in Ottoman Turkish as the Balük-Denis ("Fish Sea") from its high productivity.

Optymistychna Cave (Ukrainian meaning "optimistic") is a gypsum cave located near the Ukrainian village of Korolivka. Approximately 230 km of passageways have been mapped within. As a result, it is the longest cave in Eurasia, the fifth-longest cave in the world and the longest gypsum cave in the world.

Ukraine borders Russia, Belarus, Poland, Slovakia, Hungary, Romania, and Moldova.

Duga was a Soviet over-the-horizon radar system used as part of the Soviet anti-ballistic missile early-warning network. The system operated from July 1976 to December 1989. Two operational Duga radars were deployed, one near Chernobyl in the Ukraine and the other in eastern Siberia.

Dnieper is the fourth longest river in Europe. The river is one of the symbols of the Ukrainian nation, it splits the country into two regions: Right-Bank Ukraine and Left-Bank Ukraine.

Chernozem (pictured, literally black earth) is a soil containing a high percentage of humus. It is very fertile and produces a high agricultural yield. Chernozem occurs in many places in the world, but it is the most common and the deepest in Ukraine. Throughout its history, Ukraine has been one of the powerhouses of world agriculture due to its fertile conditions.

The Holodomor was a man-made famine in the Ukrainian SR in 1932-1933. It was caused mostly by bad economic policies. Many believe that the destruction of the Ukrainian peasantry was premeditated on the part of Joseph Stalin and consider Holodomor a genocide comparable to the Holocaust. Between 2 and 5 million people starved to death despite the fact that Ukrainian lands are among the most fertile in the World.