The Klang Valley is physically delineated by the Titiwangsa Mountains to the north and the east and the Straits of Malacca to the west. It stretches to Rawang in the northwest, to Semenyih in the southeast, and to Klang and Port Klang in the southwest. The conurbation is the centre of Malaysia's industry and trade.
The valley is named after the Klang River, the main river that passes through it, which begins at the Klang Gates Quartz Ridge in Gombak and passes into the Malacca Straits in Port Klang. The river is closely related to the early development of the region as a network of tin mining towns at the end of the 19th century. The growth of the region took place mainly in the East-West direction (between Gombak and Port Klang) but the urban areas surrounding Kuala Lumpur have since expanded north and south towards the Perak and Negeri Sembilan borders.
Klang Valley is the densest region within Peninsular Malaysia. With close to 8 million people, it is an urban agglomeration. Although the Klang Valley technically comprises of different cities and suburbs, integration between these cities is very high, with a highly developed road network and an enhanced integrated rail transit system. Many expressways cross the metropolis, making cars the most convenient way to get around.
However, this has contributed to the Klang Valley's infamous traffic jams, which stretch several kilometres of highways and make driving exhausting during peak hours. To curb this, the government has implemented The Klang Valley integrated system which comprises of the KTM, LRT and MRT and monorail. The system is currently being upgraded to include a new MRT line and LRT line as well as a monorail serving Putrajaya