Dunstable ( DUN-stə-bəl) is a market town and civil parish in Bedfordshire, East of England. It lies on the eastward tail spurs of the Chiltern Hills, 30 miles (50 kilometres) north of London. These geographical features form several steep chalk escarpments most noticeable when approaching Dunstable from the north. Dunstable is the largest settlement in Central Bedfordshire and the third largest in Bedfordshire behind Luton and Bedford. Along with Houghton Regis and the much larger town of Luton it forms the westernmost part of the Luton/Dunstable Urban Area.