Belfast is the district and capital city of Northern Ireland, and one of the chief ports of the British Isles. Situated on the Lagan River, it is just over 100 miles north of Dublin, and straddles the boundary of counties Antrim and Down. Downtown Belfast is largely Victorian in style, with numerous churches, parks, and buildings dotting its landscape. Within the city is Donegall Square, site of the copper-domed City Hall, Great Victoria Street, home to the city's opera house, and the Albert Memorial and its famous clock-tower.