Belfast County is a county in Northern Ireland, located in the province of Ulster. It is bordered by the counties of Antrim, Down, Armagh, and Londonderry. Antrim is the northernmost county in Belfast County, and its name comes from the Irish Aontroim, meaning 'solitary ridge'. It is home to the city of Belfast, the capital of Northern Ireland, as well as the towns of Antrim, Ballymena, Carrickfergus, and Larne. Antrim is known for its beautiful landscapes, including the Antrim Coast and Glens of Antrim.