North Ayrshire in the context of "Isle of Arran"

The Firth of Clyde is the estuary of the River Clyde, on the west coast of Scotland. The Firth has some of the deepest coastal waters of the British Isles and is sheltered from the Atlantic Ocean by the Kintyre Peninsula. The Firth lies between West Dunbartonshire in the north, Argyll and Bute in the west, and Inverclyde, North Ayrshire and South Ayrshire in the east. Kilbrannan Sound is a large arm of the Firth, separating the Kintyre Peninsula from the Isle of Arran. The Kyles of Bute separates the Isle of Bute from the Cowal Peninsula. The Sound of Bute separates the islands of Bute and Arran.

The Highland Boundary Fault crosses the Firth. The Firth also played a vital military role during World War II.

The Islands of the Firth of Clyde are the fifth largest of the major Scottish island groups after the Inner and Outer Hebrides, Orkney and Shetland. They are situated in the Firth of Clyde between Argyll and Bute in the west and Inverclyde, North Ayrshire and South Ayrshire in the east. There are about forty islands and skerries. Only four are inhabited, and only nine are larger than 40 hectares (99 acres). The largest and most populous are Arran and Bute. They are served by dedicated ferry routes, as are Great Cumbrae and Holy Island. Unlike the isles in the four larger Scottish archipelagos, none of the isles in this group are connected to one another or to the mainland by bridges.

The geology and geomorphology of the area is complex, and the islands and the surrounding sea lochs each have distinctive features. The influence of the Atlantic Ocean and the North Atlantic Drift create a mild, damp oceanic climate. There is a diversity of wildlife, including three species of rare endemic trees.

Ayrshire (Scottish Gaelic: Siorrachd Inbhir Àir, pronounced [ˈʃirˠəxk iɲiˈɾʲaːɾʲ]) is an historic county and registration county, in south-west Scotland, located on the shores of the Firth of Clyde. The lieutenancy area of Ayrshire and Arran covers the entirety of the historic county as well as the island of Arran, formerly part of the historic county of Buteshire. Its principal towns include Ayr, Kilmarnock and Irvine and it borders the counties of Renfrewshire and Lanarkshire to the north-east, Dumfriesshire to the south-east, and Kirkcudbrightshire and Wigtownshire to the south. Like many other counties of Scotland, it currently has no administrative function, instead being sub-divided into the council areas of East Ayrshire, North Ayrshire and South Ayrshire. It has a population of approximately 366,800.

The electoral and valuation area named Ayrshire covers the three council areas of East Ayrshire, North Ayrshire and South Ayrshire, therefore covering the whole historic county of Ayrshire but also including the Isle of Arran, Great Cumbrae and Little Cumbrae from the historic county of Buteshire. The three council areas together also form the Ayrshire and Arran lieutenancy area.

Renfrewshire (/ˈrɛnfruːʃɪər, -ʃər/) (Scots: Renfrewshire; Scottish Gaelic: Siorrachd Rinn Friù) is one of the 32 council areas of Scotland. Renfrewshire is located in the west central Lowlands. It borders East Renfrewshire, Glasgow, Inverclyde, North Ayrshire and West Dunbartonshire, and lies on the southern bank of the River Clyde. The current council area of Renfrewshire was established in 1996. The town of Paisley is the area's main settlement and centre of local government. The area also contains the historic county town of Renfrew.

The council area has the same name as the historic county of Renfrewshire, which had been abolished for local government purposes in 1975, but the modern council area only covers the central part of the historic county. The eastern part of the pre-1975 county is covered by the East Renfrewshire council area, and the western part by the Inverclyde council area.

Inverclyde (Scots: Inerclyde, Scottish Gaelic: Inbhir Chluaidh, pronounced [iɲiɾʲˈxl̪ˠuəj], "mouth of the Clyde") is one of 32 council areas used for local government in Scotland. Together with the East Renfrewshire and Renfrewshire council areas, Inverclyde forms part of the historic county of Renfrewshire, which currently exists as a registration county and lieutenancy area. Inverclyde is located in the west central Lowlands. It borders the North Ayrshire and Renfrewshire council areas, and is otherwise surrounded by the Firth of Clyde.

Inverclyde was formerly one of nineteen districts within Strathclyde Region, from 1975 until 1996. Prior to 1975, Inverclyde was governed as part of the local government county of Renfrewshire, comprising the burghs of Greenock, Port Glasgow and Gourock, and the former fifth district of the county. Its landward area is bordered by the Kelly, North and South Routen burns to the southwest (separating Wemyss Bay and Skelmorlie, North Ayrshire), part of the River Gryfe and the Finlaystone Burn to the south-east.

South Ayrshire (Scots: Sooth Ayrshire; Scottish Gaelic: Siorrachd Àir a Deas, pronounced [ˈʃirˠəxk aːɾʲ ə ˈtʲes̪]) is one of thirty-two council areas of Scotland, covering the southern part of Ayrshire. It borders onto Dumfries and Galloway, East Ayrshire and North Ayrshire. South Ayrshire had an estimated population in 2021 of 112,450, making it the 19th–largest subdivision in Scotland by population. With an area of 472 sq mi, South Ayrshire ranks as the 15th largest subdivision in Scotland.

South Ayrshire's administrative centre is located in its largest town, Ayr. The headquarters for its associated political body, South Ayrshire Council, is housed at the town's County Buildings, located in Wellington Square. Ayr is the former county town of the historic Ayrshire county, with the political activity of the Ayrshire County Council being based at County Buildings. From 1975 to 1996 under the name Kyle and Carrick (Scottish Gaelic: A' Chùil agus a' Charraig) it was one of nineteen local government districts in the Strathclyde region.