The Caspian Sea is bounded by the Republic of Turkmenistan to the southeast.
Caspian Sea . It is bounded by Kazakhstan to the northeast , Russia to the northwest , Azerbaijan to the west , Iran to the south , and Turkmenistan to the southeast . Turkmenistan ( [ tɜːrkmɛnᵻˈstɑːn ] Türkmenistan / Түркменистан / توركمنستان , [ tyɾkmeniˈθtɑn ] ) , formerly known as Turkmenia , is a country in Central Asia , bordered by Kazakhstan to the northwest , Uzbekistan to the north and east , Afghanistan to the southeast , Iran to the south and southwest , and the Caspian Sea to the west .