This zip file contains the Standard Area Measurements (SAM) for the electoral areas in the United Kingdom as 31 December 2022. This includes Westminster parliamentary constituencies, Senedd constituencies and electoral regions in Wales, and Scottish Parliament constituencies and regions in Scotland. All measurements provided are ‘flat’ as they do not consider variations in relief, e.g. mountains and valleys. Measurements are given in hectares (10,000 square metres) to 2 decimal places. Four types of measurements are included: total extent (AREAEHECT), area to mean high water (coastline) (AREACHECT), area of inland water (AREAIHECT) and area to mean high water excluding area of inland water (land area) (AREALHECT). The Eurostat-recommended approach is to use the ‘land area’ measurement to compile population density figures.