Galway Bay (Irish: Loch Lurgain or Cuan na Gaillimhe) is a large bay (or sea lough) on the west coast of Ireland, between County Galway in the province of Connacht to the north and the Burren in County Clare in the province of Munster to the south. Galway city is located on the northeast side of the bay. The bay is about 50 kilometres (31 mi) long and from 10 kilometres (6.2 mi) to 30 kilometres (19 mi) in breadth. The Aran Islands (Oileáin Árann) are to the west across the entrance and there are numerous small islands within the bay. To the west of Galway, the rocks are granite but to the south they are limestone.