Chesterfield is a large market town and borough in Derbyshire, England, 24 miles (39 km) north of Derby and 11 miles (18 km) south of Sheffield at the confluence of the River Rother and River Hipper. In 2011 the town had a population of 88,483, making it Derbyshire's second largest settlement after Derby. Its borough, including Whittington, Brimington and Staveley, had a population of 103,801 in 2011. It has been traced to a transitory Roman fort of the 1st century AD. The name of the later Anglo-Saxon village comes from the Old English ceaster (Roman fort) and feld (pasture). It has a sizeable street market three days a week. The town sits on an old coalfield, but little visual evidence of mining remains. Its main landmark is the crooked spire of the Church of St Mary and All Saints.