The Gubastan petroglyphs (see https://en.wikipedia.org/wiki/Gobustan_National_Park#Prehistoric_carvings
are not just squatting man lookalikes as there are 6000 of them dated between 5000 and 40,000 years ago. These depict, among other things, dolphins, porpoise and whales in the Caspian Sea. This means that at some stage there was an outlet into the sea – most probably the Arctic Oceean.
See also http://donsmaps.com/gobustan.html