stable during Renfrewshire's time as an administrative county. In 1974, the constituency of Greenock was abolished and joined with Port Glasgow to create the constituency of Greenock and Port Glasgow. With counties abolished for local government purposes, more wholesale reform of the constituency system in Scotland occurred in the 1980s, following the Third Periodic Review carried out by the Boundary Commission for Scotland, and a number of alterations were made before settling on the present system for the 2005 General Election laid out in the Fifth Periodic Review. Today, two of the three local council areas in the County of Renfrew have a single constituency: East Renfrewshire and Inverclyde, whilst the Renfrewshire council area is divided into the constituencies of Paisley and Renfrewshire North and Paisley and Renfrewshire South. Geography Francis Hindes Groome's Ordnance Gazetteer for Scotland observes that the geography of the county can be seen as "falling into three divisions - hilly, gently rising, and flat". The higher areas are found to the south and west, particularly into the Renfrewshire Hills and to the border with Ayrshire, with large areas of moorland. The land slopes downward to the River Clyde with the River Cart (formed by the White Cart Water and Black Cart Water) and the River Gryffe, all of which eventually flow into the River Clyde, providing drainage to the lower parts of the area. In the west of Renfrewshire can be found a number of small bodies of water such as Loch Thom and the Gryfe Reservoir, with Barr Loch and Castle Semple Loch in the south. A number of smaller hills and lochs are in the south-east in the county, with the Dams to Darnley Country Park separating Newton Mearns and Barrhead with a number of artificially dammed lakes including Balgray Reservoir, Ryat Linn Reservoir and Waulkmill Glen Reservoir. The upper scenery of the county was described in the 1911 Encyclopædia Britannica as "somewhat wild and bleak" though descending into pastureland around the rivers. The north-east of the county is heavily urbanised and forms part of the Greater Glasgow conurbation. The geology of the Renfrewshire is notable for its volcanic origins. Economy Textiles The traditional industries of Renfrewshire were noted for their variety and diversity. Weaving and associated trades were common in the county and Paisley became particularly notable for this industry. The Paisley pattern remains a symbol of the area and its weaving past