Shah Deniz gas field is located in Caspian_Sea

Shah Deniz gas field is the largest natural gas field in Azerbaijan. It is situated in the South Caspian Sea, off the coast of Azerbaijan, approximately 70 kilometres (43 mi) southeast of Baku, at a depth of 600 metres (2,000 ft). The field covers approximately 860 square kilometres (330 sq mi). The Shah Deniz gas and condensate field was discovered in 1999. Stretching out over 140 square kilometres, the reservoir is similar in size and shape to Manhattan Island.

• http://en.wikipedia.org/wiki/Shah Deniz gas field