Ballina, with a population of 8000 people, is the largest town in County Mayo. Built on the River Moy, one of Mayo's richest salmon and trout rivers, Ballina's bridges are busy with anglers throughout the season. The original settlement at Ballina was at Ardnaree, on the east side of the river. This site is marked by the ruins of a 14th century Augustinian friary. Near Ballina's railway station is the Dolmen of the Four Maols, three large rocks, capped by a massive boulder, a tombstone dating from the Bronze Age.