Top 10 Unusual Landscapes - Gates to Hell, Turkmenistan It is estimated that Turkmenistan owns the world’s fifth largest reserves of natural gas. In May 2011, this was discovered in Turkmenistan – the second largest gas deposit, the South Yoloten gas field. It covers 1,500 square miles and is preceded by Iran’s South Pars gas field, the world’s largest.  Read more: http://www.toptenz.net/top-10-unusual-landscapes.php#ixzz2OmZF3yH6