Definition: Caspian is a term that refers to the region of the world known for its rich history and culture, which includes significant archaeological sites such as the site of Khan el-Khali in Kazan, Russia. The Caspian Sea is located between Iran and Kazakhstan, and it is considered one of the four great oceans by scientists. It is also known for its extensive natural resources, including oil, gas, and salt. In recent years, there has been a resurgence in interest in the