Sheppey, THE ISLE OF, in the N. of Kent, is separated from the mainland by the Swale and the estuary of the Medway, and has an area of some 30,000 acres, including water, with a length of 9 and a breadth of 5 miles. Marshy to the S., it rises to the height of 60 or 80 feet to the N.; and the soil, consisting wholly of London Clay, is fertile and yields good corn-crops, besides pasturing large flocks of sheep. Sheerness (q.v.) is at its N.E. extremity.