Colchester is a town in Essex, England. It is the oldest recorded town in Britain, with evidence of settlement dating back to before the Roman conquest. The town is located in the county of Essex, which has a population of over 1.7 million people. Colchester is known for its rich history and culture, and is home to many historic sites, including Colchester Castle and the Roman wall. It is also home to the University of Essex, one of the top universities in the UK.