Kashagan is considered to be one of the world's biggest oil discoveries in 45 years. Measuring 75kmlong and 45kmwide, the shallowwater field covers 2,678km² in the Caspian Sea. Loed beneath the seabed, the highlypressurised Kashagan reservoir is estimated to contain more than 35 billion barrels of oil, out of which up to 13 billion barrels are recoverable.