The Kal'chik, or Kal'mius River is a river in Ukraine. It flows from Donetsk into the Azov Sea, which it enters near the city of Mariupol. Formerly known as the Kalka River, it was the scene of the Battle of the Kalka River between the Mongol Empire and Kievan Rus' in 1223. In general English usage, length (symbol: l) is but one particular instance of distance – an objects length is how long the object is – but in the physical sciences and engineering, the word length is in some contexts used synonymously with distance. Height is vertical distance; width (or breadth) is... A kilometre (American spelling: kilometer) (symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). ... Elevation has several related meanings: Geography The elevation of a geographic location is its height above mean sea level (or possibly some other fixed point). ... The metre (American spelling: meter), symbol: m, is the basic unit of distance (or of length, in the parlance of the physical sciences) in the International System of Units. ... In hydrology, the discharge of a river is the volume of water transported by it in a certain amount of time. ... The cubic metre (symbol m³) is the SI derived unit of volume. ... This article is about the unit of time. ... A watershed or catchment basin is the region of land whose water drains into a specified body of water, such as a river, lake, sea, or ocean. ... Square kilometre (US spelling: Square kilometer), symbol km², is an SI unit of surface area. ... The shallow Sea of Azov is clearly distinguished from the deeper Black Sea. ... For the term related to television programmes, see watershed (television). ... For the Second World War frigate class, see River class frigate The Murray River in Australia A waterfall on the Ova da Fedoz, Switzerland A river is a large natural waterway. ... Categories: Stub | Cities in Ukraine ... The shallow Sea of Azov is clearly distinguished from the deeper Black Sea. ... Mariupol is a city in the Ukraine. ... Battle of Kalka River (31st May, 1223 N.S.) was the first military engagement between the Mongol armies of Genghis Khan and the East Slavic warriors. ... The Mongol Empire (1206–1368) was an empire founded by Genghis Khan in 1206. ... Kievan Rus′ (Ки́евская Ру́сь, Kievskaya Rus in Russian; Київська Русь, Kyivs’ka Rus’ in Ukrainian) was the early, mostly East Slavic¹ state dominated by the city of Kiev (ru: Ки́ев, Kiev; uk: Ки́їв, Kyiv), from about 880 to the middle of the 12th century. ... Events August 6 - Louis VIII is crowned King of France. ...