Heves county (Heves vármegye, ˈhɛvɛʃ) lies in northern Hungary, between the right bank of the river Tisza and the Mátra and Bükk mountains. It shares borders with the Hungarian counties Pest, Nógrád, Borsod-Abaúj-Zemplén and Jász-Nagykun-Szolnok. Eger is the county seat. Lake Tisza Bükk National Park Bélapátfalva, abbey Castle and City of Eger Erdőtelek Arboretum Feldebrő, 11th century Romanesque church Gyöngyös, Mátra Museum Hatvan, Grassalkovich mansion Kisnána castle Noszvaj, De la Motte mansion Parád Sirok castle Szilvásvárad, Szalajka Valley Szarvaskő, castle ruins Heves county is a geographically diverse area; its northern part is mountainous (the Mátra and Bükk are the two highest mountain ranges in Hungary), while at south it includes a part of the Great Hungarian Plain. From south it is bordered by Lake Tisza, the largest artificial lake in Hungary. The average temperature is between 8 and 10 °C (higher on the southern parts of the county). Zagyva Tarna Tisza Laskó Kékestető, Mátra Mountains (1014 m; highest in Hungary) Kisköre (86 m.) The county was a primary target for the Ottoman Empire during the Ottoman-Hungarian Wars where the Siege of Eger took place. Demographics of Hungary In 2015, it had a population of 301,296 and the population density was 83/km2. Besides the Hungarian majority, the main minorities are the Roma (approx. 19,000), Germans (1,000) Slovaks (500) and Romanians (500). Total population (2011 census): 308,882 Ethnic groups (2011 census): Identified themselves: 279,714 persons: Hungarians: 257,659 (92.12%) Gypsies: 19,312 (6.90%) Others and indefinable: 2,743 (0.98%) Approx. 43,000 persons in Heves County did not declare their ethnic group at the 2011 census. Religion in Hungary Religious adherence in the county according to 2011 census: Catholic – 162,014 (Roman Catholic – 160,885; Greek Catholic – 1,098); Reformed – 14,729; Evangelical – 1,084; Other religions – 4,894; Non-religious – 43,193; Atheism – 3,298; Undeclared – 79,670.