Why is it called the Black Sea?
Why is the Black Sea named?
In ancient times, Greece called the Black Sea ; This is because of the difficulty of navigating in it, and the presence of tribes hostile to Greece on its shores, and after a period of time during which Greece succeeded in colonizing the shores of the Black Sea, they called it (the Hospitable Sea), and for its current name (the Black Sea), its name goes back to two hypotheses: the first is that sailors see its dark waters. very close to black; This is due to severe storms in the winter.
As for the second hypothesis, it is based on the fact that the waters of the Black Sea are full of hydrogen sulfide, and in its deep layers there are no living creatures except sulfur bacteria. Therefore, ships, dead animals and plants that sink at a depth of more than 150 meters and remain for a long time are covered with black sludge due to the high concentration of sulfide Hydrogen makes the sea black. 
The Black Sea has a size of 168,500 square miles; equivalent to 436,400 square kilometers, and a depth of 7,218 feet; Which is equivalent to 2,200 meters, and many rivers flow into the Black Sea, the most important of which are the Danube and Dnipro, and this sea for a long time was very important in terms of regional trade, and now also the Black Sea is a major route for energy transfer from Russia and Western Asia to Europe, and is One of the world's busiest waterways; In 2005, more than 55,000 ships passed through it. 
Black Sea Location
The Black Sea is located in the far southeast of Europe, bordered to the north by Ukraine, to the northeast by Russia, to the south by Turkey , to the east by Georgia, and to the west by Bulgaria and Romania. It is connected to the Atlantic Ocean by the Bosphorus Strait. In the Black Sea there are small numbers of small islands . 
- Irina Dreyvitser, "Why are The Seas named Black, White, and Yellow?"، ssec.si.edu, Retrieved 2018-11-15. Edited.
- "The Black Sea, Maps And Details", www.worldatlas.com, Retrieved 2018-11-15. Edited.
- Luch Fomin, Vladimir Goncharov, Aleksey Kosarev (2018-9-21), "Black Sea"، www.britannica.com, Retrieved 2018-11-15. Edited