Košice is the biggest city in eastern Slovakia. It is situated on the river Hornád at the eastern reaches of the Slovak Ore Mountains. It lies in the eastern part of Slovakia, not far from the borders with Hungary (20 km), Ukraine (80 km) and Poland (90 km). With a population of approximately 240,000, Košice is the second largest city in Slovakia after the capital Bratislava. Being the economic and cultural center of eastern Slovakia, Košice is the seat of the Košice Region and Košice Self-governing Region, the Slovak Constitutional Court, three universities, various dioceses, and many museums, galleries, and theatres. Košice is an important industrial center of Slovakia. The city has a well-preserved historical center, which is the largest among Slovak towns. There are many heritage protected buildings in Gothic, Renaissance, Baroque, and Art Nouveau styles with Slovakia's largest church: the St. Elisabeth Cathedral. The long main street, rimmed with aristocratic palaces, Catholic churches, and townsfolk's houses, is a thriving pedestrian zone with many boutiques, cafés, and restaurants. The average age of citizens is 35.13 years, which has led to Košice becoming known as the city of youth. The education system is significantly represented in the city, with over 45 basic schools, 10 grammar schools, 4 commercial academies, and 15 specialized secondary schools covering industrial technologies, agriculture, health care and the arts. There is also the Technical University with 8 faculties, P. J. Šafárik University with 4 faculties, the University of Economics and the University of Veterinary Medicine.