Vice President Exploration Appointed

September 20, 2007

September 20, 2007 – Guernsey, British Channel Islands – Tethys Petroleum Limited (“Tethys”) (TSX:TPL), today announced the appointment of Rosemary Johnson-Sabine as Vice President Exploration.

Rosemary joins Tethys from the Danish independent oil company Maersk Oil and Gas where she was Managing Director of the London office and Vice President Exploration and New Business Development, recently focused on developing Maersk’s business in Kazakhstan. Rosemary will work alongside Tethys’ Vice President Technical, Graham Wall, together providing the exploration and development support for the progression of Tethys’ business in Kazakhstan, Tajikistan and potentially other parts of Central Asia.

Rosemary trained as a geologist and a geophysicist and is a skilled explorationist, having some 26 years experience in the industry working in a variety of positions in geophysics, exploration management, new business development and in upstream and downstream commercial functions in many parts of the world for government agencies, independent oil companies and majors. She was Exploration Manager of the successful UK independent Monument Oil and Gas, and Exploration Manager Europe for Texaco. In 1991 she was named UK “Explorer of the Year” and in 2002 was awarded an OBE by Queen Elizabeth for services to the oil industry. Rosemary is a past Chairman of the Petroleum Exploration Society of Great Britain (PESGB) and past President of the European Association of Petroleum Geoscientists (EAPG). Since 2003 she has been a Board Member of the British Geological Survey (BGS).

Commenting on the appointment Dr David Robson, Chairman, President and Chief Executive Officer of Tethys said “I am delighted to welcome Rosemary to the Tethys team! We are extremely pleased to have one of Europe’s leading explorationists working with Tethys and we look forward to her input and direction to our active exploration programmes in Kazakhstan and Tajikistan. Rosemary brings with her a wealth of experience in many areas of the business and I am sure that her skills will greatly assist Tethys in developing the significant potential we see in our existing properties in Central Asia as well as possible new projects in the region”.

Tethys is focused on oil and gas exploration and production activities in Central Asia with activities currently in the Republic of Kazakhstan and more recently the Republic of Tajikistan. This highly prolific oil and gas area is rapidly developing and Tethys believes that significant potential exists in both exploration and in discovered deposits.

This press release contains “forward-looking information” which may include, but is not limited to, statements with respect to our operations. Such forward looking statements reflect our current views with respect to future events and are subject to certain risks, uncertainties and assumptions, including, the risks and uncertainties outlined under the section titles “Risk Factors and Uncertainties” in our prospectus (available at Should one or more of these risks materialise, or should underlying assumptions prove incorrect, actual results may vary materially from those anticipated, believed, estimated or expected.

For more information please contact:

Sabin Rossi
Investor Relations Manager
Tethys Petroleum Limited
TD Canada Trust Tower
161 Bay Street, 27th Floor
Toronto N5J 2S1

Office: 1-416-572-2065
Fax: 1-416-572-2201
Cell: 1-617-669-1841