In what country by the Black Sea is the capital called Tbilisi?

Explanation

The former Soviet Republic Georgia is a country located in the Western and Central parts of Caucasus with 5 million inhabitants. The biggest cities are Tbilisi, Kutaisi, Batumi and Rustavi. The capital Tblisi is located by the river Mtkvari (or Kura) and has more than 1.3 million inhabitants. The Georgian flag is red and white.