UPDATE 1-Three firms bid for S.Lanka oil exploration-oilmin
The government says seismic data shows more than a billion barrels of oil lie under the sea off Sri Lanka's northwest coast, though no reserves have yet been proven.
If proven, the reserves would be a major boost for the war-torn country, which produces no oil and imported $2.2 billion worth in the first 11 months of 2007. (Editing by James Jukwey)
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