The Klang River () is a river which flows through Kuala Lumpur and Selangor in Malaysia and eventually flows into the Straits of Malacca. It is approximately in length and drains a basin of about . The Klang River has 11 major tributaries. Because the river flows through Klang Valley, which is a heavily populated area of more than four million people, it is considerably polluted, because of deep siltation caused by human waste from informal settlers of the riverbank and even from some business establishments without septic tanks or sewage treatment plants and by soil carried by mudflows from mountains. Heavy development has narrowed certain stretches of the river to the point that it resembles a large storm drain in some places. This contributes to flash floods in Kuala Lumpur, especially after heavy rain. Course [ { "type": "ExternalData", "service": "geoline", "ids": "Q619086", "properties": { "stroke": "#669999", "stroke-width": 6 } }, ] The Klang River originates from the Klang Gates Quartz Ridge in Gombak, near the border with Pahang, northeast of Kuala Lumpur. It is joined by 11 major tributaries. These include the Gombak River, Batu River, Kerayong River, Damansara River, Keruh River, Kuyoh River, Penchala River and Ampang River. It flows into the Straits of Malacca to the west. Places named after the river The river's confluence with the Gombak River gave rise to the name of Kuala Lumpur, Malaysia's capital city. Kuala Lumpur means "muddy estuary", and this definition almost applies to the modern time because of siltation mentioned above. It is also thought that Klang town is named after the river. Cities and towns on its banks The river begins in Ampang Jaya, Selangor, then turn down along Ampang–Kuala Lumpur Elevated Highway till the city centre. Kuala Lumpur is situated at the point where the Gombak River flows into the Klang River. The confluence is located behind Masjid Jamek. It then flows south-west through Brickfields, Bangsar, Lembah Pantai, Old Klang Road and Jalan Puchong, then become the border of Petaling Jaya and Subang Jaya until PJS7, later passing UEP Subang Jaya, before making a U-turn in Puchong and Putra Heights. Further downstream, the river flows through Selangor's state capital, Shah Alam. Klang city is situated on the lower stretches of the river. Malaysia's biggest sea port, Port Klang, is also situated at the estuary of the Klang River. Dams There are two major dams upstream of