News Releases

April 18, 2008

Shares Outstanding: 13,928,084

TSX: “ISR”               

DOMESTIC AND INTERNATIONAL UPDATE

International Sovereign Energy Corp. (the “Company ”) is pleased to report that the Company’s Annual Information Form (AIF) for the year ended December 31, 2007 has been filed on Sedar on March 28, 2008 and can be accessed at www.sedar.com. The AIF includes the disclosure and reports relating to reserve data and other oil and gas information required pursuant to National Instrument 51-101.

The Company’s reserves were evaluated by Chapman Petroleum Engineering Ltd. (independent engineers) for the Company’s oil and gas property interests in accordance with standards set out in the Canadian Oil and Gas Evaluation Handbook.

International Sovereign Energy Corp. is an oil and gas exploration development and production company with offices in Vancouver, British Columbia, Calgary, Alberta and Islamabad, Pakistan and is active in the exploration and development of hydrocarbon reserves in Western Canada and internationally.

For further information, please contact:

Omair Choudhry

Chief Financial Officer

Tel:   (604) 684-7372

Fax:   (604) 684-2407

Or visit our website at www.isove.com

The Toronto Stock Exchange has not reviewed and does not accept responsibility for the adequacy or accuracy of this release. Certain information provided in this press release contains forward-looking statements that by their nature are subject to numerous risks and uncertainties and readers are cautioned that actual results may vary considerably from those forecasted.

Forward-looking statements: This news release contains certain forward-looking statements, including management’s assessment of future plans and operations, and capital expenditures and the timing thereof, that involve substantial known and unknown risks and uncertainties, certain of which are beyond the Company’s control. The Company’s actual results, performance or achievements could differ materially from those expressed in, or implied by, these forward-looking statements and, accordingly, no assurance can be given that any of these events anticipated by the forward-looking statements will transpire or occur, or if any of them do so, what benefits, including the amount of proceeds, that the Company will derive there from. Additional information on the Company’s operations and financial results are included in reports on file with Canadian securities regulatory authorities and may be accessed through the SEDAR website (www.sedar.com). All subsequent forward-looking statements, whether written or oral, attributable to the Company or persons acting on its behalf are expressly qualified in their entirety by these cautionary statements. Furthermore, the forward-looking statements contained in this news release are made as at the date of this news release and the Company does not undertake any obligation to update publicly or to revise any of the included forward-looking statements, whether as a result of new information, future events or otherwise, except as may be required by applicable securities laws.