The correct answer is option 1: Black Sea. The Sea of Azov is connected to the Black Sea. It is located between Ukraine to the northwest and Russia to the southeast. The Black Sea is located to the southwest of the Sea of Azov and is connected to it through the Strait of Kerch. The Strait of Kerch is a narrow strait that separates the Crimean Peninsula from the Russian mainland. It is approximately 4.5 kilometers wide at its narrowest point. The Sea of Azov is relatively shallow, with an average depth of about 7 meters. It is also relatively small in size compared to the Black Sea. The Sea of Azov has a surface area of about 39,000 square kilometers, while the Black Sea has a surface area of about 436,400 square kilometers.