Great Cumbrae (also known as Great Cumbrae Island, Cumbrae or the Isle of Cumbrae) is the bigger of the two islands known as The Cumbraes in the lower Firth of Clyde in western Scotland. Residence to the National Watersports Centre, the Cathedral of the Isles as well as the College Marine Biological Station, Millport, the holiday island has an 18-hole fairway which sweeps virtually to the top, and a round-island road much favoured for household cycle runs. The island is approximately 4 kilometres (2.5 mi) long by 2 kilometres (1.2 mi) vast, rising to a height of 127 metres (417 feet) above water level at "The Glaid Stone" - a huge, normally happening rock set down on the highest possible top on the island. There is a triangulation pillar nearby, as well as an alignment factor which indicates the areas of bordering spots. Millport, the island's only community, is spread around a bay which makes up the entire south shore of the island. The usual island population of 1,376 as recorded by the 2011 census was a small fall from the 2001 figure of 1,434. The population raises substantially throughout the summertime vacationer period due to the high proportion of second residences.