Aberystwyth is a historic market town, administrative centre and holiday resort within Ceredigion, Wales. Often colloquially known as Aber, it is located at the confluence of the rivers Ystwyth and Rheidol. Since the late 19th century, Aberystwyth has also been a major Welsh educational centre, with the establishment of a university college there in 1872. The town's population was officially 15,935 in the 29 April 2001 census or 16,928 if local-government wards are tallied. During nine months of the year, there is an influx of students—to a total number of 8841 at July 2009, but there is no reliable measure of the number of those students whose family residence is outside Aberystwyth.