The area covered by this report extends from the eastern coast of Scotland and northern England to the international median line in the North Sea where the UK sector joins Norwegian, Danish, German and Dutch waters. From south to north, the area extends from 55 degrees N to 58 degrees N, but it reaches only as far as 57 degrees 30'N to the west of 0 degrees. This report area includes much of the Central Graben and its junction with the Viking Graben and Outer Moray Firth Basin; it contains several important oilfields, the largest of which is Forties.