Llanishen (Welsh Llanisien llan church + Isien Saint Isan) is a district in the north of Cardiff, the capital city of Wales. The Cardiff ward population taken at the 2011 census was 17,149. Llanishen is well known as the home of the 'Tax Offices', the tallest buildings in north Cardiff and a landmark for miles around. The office complex overlooks the 'Crystal and Fishguard estates', Parc Ty Glas industrial estate, old village, leafy suburban roads and various parkland that constitute the district. Llanishen is also home to a fully featured Leisure Centre and the former 60-acre (240,000 m2) Llanishen Reservoir - a local beauty spot that is connected to a green corridor which bisects the city from the rising hills in the north to Cardiff Bay in the south.