Mahon Point, or Mahon as it is sometimes referred, is an area to the south-eastern side of Cork City. It gets its name from Lough Mahon, a wide stretch of the upper section of Cork Harbour. It was once a peninsula of green fields and estates but in recent years has seen many developments. The area was generally known as the Ring of Mahon, and is the site of Ringmahon House. Mahon is located in a central position in the greater Cork area with the South Ring Road running along its eastern and southern edges and entering the Jack Lynch Tunnel under the River Lee. The road gives access to Cork Airport as well as Cork City Centre. The area is mainly residential with housing estates packed densely throughout. It is home to the Mahon Point Shopping Centre which is Cork's biggest shopping centre and retail park. It is also the home to City Gate, a large office and medical development. Other places of interest in the area include Blackrock Castle Observatory, the Marina and Dundanion Castle. The area has numerous bus routes include the 202, 215, 215A and 219. There are also numerous sports club in the area including GAA clubs and Mahon Golf Club. Mahon is also home to two primary schools and one secondary school.