Oxfordshire is a county in the United Kingdom. It is in South East England, and borders Warwickshire, Northamptonshire, Buckinghamshire, Berkshire, Wiltshire and Gloucestershire . The county has major education and tourist industries and is noted for the concentration of performance motorsport companies and facilities. Oxford University Press is the largest firm among a concentration of print and publishing firms; the University of Oxford is also linked to the concentration of local biotechnology companies. The main centre of population is the city of Oxford. Other significant settlements are Banbury, Bicester, Kidlington and Chipping Norton to the north of Oxford; Carterton and Witney to the west; Thame and Chinnor to the east; and Abingdon, Wantage, Didcot, Wallingford and Henley-on-Thames to the south. The highest point is White Horse Hill, in the Vale of White Horse, reaching . Oxfordshires county flower is the snakes-head fritillary.