Teesside is not a city, but a conurbation in Northeast England. It is made up of several towns and boroughs, including Middlesbrough, Stockton-on-Tees, and Redcar and Cleveland. Middlesbrough is often considered the largest and most prominent town in Teesside. The area has a rich industrial heritage, particularly in steel and chemicals, and is known for its beautiful coastline, countryside, and cultural attractions.