If you haven't already done so it would be useful to look at the distribution maps provided from the "research pages".

"Warwickshire, a county in the west-midlands of England; bounded N. by Staffordshire, Derbyshire, and Leicestershire, E. by Northamptonshire, S. by Oxfordshire and Gloucestershire, and W. by Worcestershire; greatest length, N. and S., 52 miles; greatest breadth, E. and W., 32 miles; area, 566,271 acres, population 737,339. Warwickshire presents a pleasant undulating surface of hill and dale, watered by the Avon, Leam, and Tame. The climate is mild and healthy, and the soil, except some cold stiff clays on the higher grounds, is fertile. It consists chiefly of a strong red loam adapted for wheat and beans, or a sandy loam for barley and turnips. Much land is kept in permanent pasture for grazing. Formerly the county was thickly wooded (that part N. of the Avon being called the Forest of Arden), and fine timber is still abundant. Geologically it mainly belongs to the secondary formation. A coal field, 16 miles by 3 miles, extends from the neighbourhood of Coventry to the border of Staffordshire, E. of Tamworth. The principal minerals are coal, ironstone, limestone, freestone, blue flagstone, and fire-clay. The manufactures are carried on chiefly at Birmingham (hardware and silk goods) and Coventry (watches and ribbons).  The county is traversed in all directions by canals and railways."

 [Bartholomew's Gazetteer of the British Isles, 1887.]