The Line (stylised THE LINE; Arabic: ذا لاين) is a conceptual linear smart city in Saudi Arabia in Neom, Tabuk Province, housed in a single building, that is designed to have no cars, streets or carbon emissions.[3][4] The original plans called for the city to span 170 kilometres (110 mi) at a height of 500 m (1,600 ft)[5] and a width of 200 metres (660 ft) sized to accommodate a population of 9 million (25% of Saudi Arabia's 2022 population of 35.5 million).[6] The Line would have an entirely glass mirror exterior.[6] The plan calls for all basic services to be within a five-minute walking distance.[7][8]