It is bounded on the north and west by the Atlantic Ocean; the south is adjacent to County Galway, the east is adjacent to County Roscommon; the northeast is adjacent to County Sligo. Mayo is the third-largest of Ireland's 32 counties in area and 15th largest in terms of population. It is the second-largest of Connacht’s five counties in both size and population. There is a distinct geological difference between the north and the south of the county. The north consists largely of poor subsoils and is covered with large areas of extensive Atlantic blanket bog, whereas the south is largely a limestone landscape. Agricultural land is therefore more productive in the south than in the north.
The highest point in Mayo and Connacht is Mweelrea, at 814 m (2,671 ft)
The river Moy in the northeast of the county is renowned for its salmon fishing
Ireland's largest island, Achill Island, lies off Mayo's west coast
Mayo has Ireland's highest cliffs (second highest in Europe) at Croaghaun, Achill island while the Benwee Head cliffs in Kilcommon Erris drop almost perpendicularly 900 feet (270 m) into the Atlantic Ocean. There is a spectacular viewing point on the top of the cliffs opposite the entrance to the Céide Fields near Ballycastle in North Mayo
The northwest areas of County Mayo have some of the best renewable energy resources in Europe, if not the world, in terms of wind resources, ocean wave, tidal and hydroelectric resources
Local government and political subdivisions
Mayo County Council (Irish: Comhairle Contae Mhaigh Eo) is the authority responsible for local government. As a county council, it is governed by the Local Government Act 2001. The council is responsible for housing and community, roads and transportation, urban planning and development, amenity and culture, and environment. For the purpose of elections the county is divided into six local electoral areas: Ballina (6), Belmullet (4), Castlebar (7), Claremorris (6), Swinford...