The Humberhead Levels is a national character area covering a large expanse of flat, low-lying land towards the western end of the Humber estuary in northern England. The levels occupy the former Glacial Lake Humber, an area bounded to the east by the Yorkshire Wolds and the northern Lincolnshire Edge, a limestone escarpment, and to the west by the southern part of the Yorkshire magnesian limestone ridge. In the north the levels merge into the slightly more undulating Vale of York close to the Escrick glacial moraine, and to the south merge into the Trent Vale.[1]
- ^ Kent, Sir Peter; Gaunt, G. D. (1980). Eastern England from the Tees to the Wash. British Regional Geology (Second ed.). London: HMSO. Natural Environment Research Council. ISBN 0-11-884121-1.