Tethys Petroleum Limited (United Kingdom) extended Kul-Bas exploration period

/KASE, August 23, 10/ - Tethys Petroleum Limited (Channel Islands), common shares of which are listed in Kazakhstan Stock Exchange (KASE) official list, provided to KASE the following press release of August 20, 2010: quotation starts Tethys Petroleum Limited ("Tethys" or the "Company") (TSX: TPL) today announced that the Ministry of Oil and Gas of the Republic of Kazakhstan ("MOG") has agreed to extend the Exploration Period for the Company's Kul-Bas Exploration and Production Contract (the "Contract") by a further two years until November 11, 2013. Suitable amendments will now be made to the Contract. The Kul-Bas contract area (which currently covers an area of 7,632 km2 (1.9 million acres)) surrounds the Akkulka contract area where the Company has recently made the AKD01 "Doris" oil discovery and where work is currently underway to appraise this oil discovery and explore the surrounding area. The original Contract terms involved a 6-year exploration period with relinquishments (after which all areas outside commercial discovery areas would be relinquished) and a 19 year production period, which could be extended. The extension to the exploration period gives Tethys an additional two years to explore this attractive area that has several prospects and leads and with a proved oil system in the Akkulka block which is surrounded by the Kul-Bas area. George Mirtskhulava, Head of Tethys' Kazakhstan Business Unit, commented: "I am very pleased that the Ministry of Oil and Gas continue to support Tethys' exploration efforts in signing the Kul-Bas Exploration Contract Extension. This represents the second contract extension that Tethys has received this year (the first being the extension of the Akkulka Exploration Contract in June) and demonstrates the ongoing support which the Kazakh authorities show to oil and gas companies who meet their contractual commitments." Contacts: Tethys Petroleum Limited Sabin Rossi Vice President Investor Relations Office: +1 416 572 2065, +1 416 572 2065 +1 416 572 2201, +1 416 572 2201 (FAX) info@tethyspetroleum.com www.tethyspetroleum.com In Kazakhstan PG Communications Ardak Akanov, Managing Director Office phone/fax: +7 (727) 272 8867 +7 (727) 272 8237, +7 (727) 272 7745 development@pressclub.kz In Asia-Pacific Quam IR Anita Wan, Associate Director Office phone/fax: + (852) 2217-2999 anita.wan@quamgroup.com quotation ends [2010-08-23]