Great Cumbrae (also referred to as Great Cumbrae Island, Cumbrae or the Isle of Cumbrae) is the bigger of the two islands referred to as The Cumbraes in the reduced Firth of Clyde in western Scotland. Home to the National Watersports Centre, the Cathedral of the Isles and the College Marine Biological Station, Millport, the holiday island has an 18-hole fairway which sweeps practically to the top, and a round-island road much favoured for family members cycle runs. The island is approximately 4 kilometres (2.5 mi) long by 2 kilometres (1.2 mi) broad, rising to a height of 127 metres (417 feet) over sea level at "The Glaid Stone" - a huge, naturally taking place rock set down on the greatest summit on the island. There is a triangulation pillar close by, as well as an alignment factor which suggests the locations of surrounding landmarks. Millport, the island's only town, is spread around a bay that makes up the whole south shore of the island. The usual island population of 1,376 as recorded by the 2011 census was a mild autumn from the 2001 number of 1,434. The population enhances significantly throughout the summer tourist period as a result of the high percentage of 2nd residences.