An oil slick caused by Israeli bombing of the Jiyyeh power station now covers 80km (50 miles) of coast.
Local environmental groups describe the slick as an "environmental disaster".
Almost as much oil may have entered the water as during the 1989 Exxon Valdez tanker incident in Alaska, which led to widespread ecological damage.
Initial reports indicated that 10,000 tonnes of heavy fuel oil had escaped from damaged tanks, but the eventual total could be 35,000 tonnes.
Turtle egg hatching may be immediately affected.
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