Endeavour Announces Approval of UK Field Development Plan

HOUSTON, June 30, 2010 - Endeavour International Corporation (NYSE-Amex: END) (LSE: ENDV)
announced today that the United Kingdom Department of Energy and Climate
Control (DECC) has approved plans for the development of the Baachus oil
field in Block 22/6a in the Central North Sea. Endeavour holds a 10 percent
interest in the 2005 discovery.

"We are pleased that the energy minister has accepted our group's plan to
develop the Baachus field," said William L. Transier, chairman, chief
executive officer and president. "This is the first approval of four field
development plans that Endeavour has submitted for review by the UK
government, and we are encouraged that the other three projects will be
approved over the next 12 months."

The plan calls for a subsea development with three wells to be drilled
and linked to production facilities at the nearby Forties Field, the largest
oil field in the North Sea operated by Apache Corporation. Apache also
operates and holds a 70 percent working interest in the Baachus development
with the remaining 20 percent interest held by Shell UK. First production is
planned for the first half of 2011.

Endeavour International Corporation is an oil and gas exploration and
production company focused on the acquisition, exploration and development of
energy reserves in the North Sea and the United States. For more information,
visit www.endeavourcorp.com.

Certain statements in this news release should be regarded as
"forward-looking" statements within the meaning of the securities laws. These
statements speak only as of the date made. Such statements are subject to
assumptions, risk and uncertainty. Actual results or events may vary
materially. The estimates of recoverable resources per well and completed
well costs included herein are based upon other typical results in these
shale plays and may not be indicative of actual results.

Investor Relations, Mike Kirksey of Endeavour International Corporation, +44-(0)-207-451-2364 or +1-713-307-8788; or UK Media, Philip Dennis, +44-(0)-207-743-6363, or Henry Lerwill, +44-(0)-203-178-6242, both of Pelham Public Relations, for Endeavour International Corporation