The Ulhas River is a river of western India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

. It originates near Karjat

Karjat

Karjat is a city, a Municipal Council, a Tahsil and a sub-district in Raigad district, Mumbai, Navi Mumbai in the Indian state of Maharashtra.-Geography:...

 in the Western Ghats

Western Ghats

The Western Ghats, Western Ghauts or the Sahyādri is a mountain range along the western side of India. It runs north to south along the western edge of the Deccan Plateau, and separates the plateau from a narrow coastal plain along the Arabian Sea. The Western Ghats block rainfall to the Deccan...

 Range, and flows westward through Raigad

Raigad district

Raigad District , also known as Raigarh District, is a district in the Indian state of Maharashtra. It is located in the Konkan region. The district was renamed after Raigad, the fort which was the former capital of the Maratha leader Shivaji, and is located in the interior regions of the district,...

 and Thane

Thane District

Thane is a district in northern Maharashtra state in western India. As of 2011 it is the most populated district in the nation. The headquarters of the district is the city of Thane. Other major cities in the district are Navi Mumbai , Kalyan-Dombivli, Mira-Bhayander, Bhiwandi, Ulhasnagar,...

 districts of Maharashtra

Maharashtra

Maharashtra is a state located in India. It is the second most populous after Uttar Pradesh and third largest state by area in India...

 between Kulgaon-Badlapur

Badlapur

Badlapur, is one of the fastest growing towns in Mumbai Conurbation, India.Due to the population growth in the nearby cities, many people working in Mumbai have moved to Badlapur for affordable real estate prices, pleasant weather, beautiful location and quiet neighborhoods along with a proximity...

, north to Ulhasnagar

Ulhasnagar

Ulhasnagar Ulhasnagar, also referred to as Sindhunagar, has an estimated population of 472,943 people .The name derives from the Ulhas river which flows through it. Kalyan is situated near Ulhasnagar. The city is home to many types of businesses....

 (to which it gives its name) and on to Kalyan, where it turns west to Thane

Thane

Thane , is a city in Maharashtra, India, part of the Mumbai Metropolitan Region, northeastern suburb of Mumbai at the head of the Thane Creek. It is the administrative headquarters of Thane district. On 16 April 1853, G.I.P...

. Near Raw water pump house of MIDC Jambhul the river meets Barvi Dam discharge water also called as Barvi River. The conflunce is a tourist and fishing hub for villagers around. At Thane the river splits into two branches which flow west and south, respectively, around Salsette Island, on which lies the metropolis of Mumbai

Mumbai

Mumbai , formerly known as Bombay in English, is the capital of the Indian state of Maharashtra. It is the most populous city in India, and the fourth most populous city in the world, with a total metropolitan area population of approximately 20.5 million...

. Both branches are estuarine

Estuary

An estuary is a partly enclosed coastal body of water with one or more rivers or streams flowing into it, and with a free connection to the open sea....

, and lie on seismic fault lines. The main branch turns northwestward to Ghodbunder, where it opens into the estuary of Vasai Creek

Vasai Creek

Vasai Creek is an estuarine creek, one of the two main distributaries of the Ulhas River in Maharashtra state of western India. The Ulhas splits at the northeast corner of Salsette Island into its two main distributaries, Vasai Creek and Thane Creek...

. Thane Creek

Thane Creek

Thane Creek is part of the estuary of the Ulhas River in western India opening into Mumbai Harbour. It comprises the area stretching from Mumbra Retibunder to the Mankhurd-Vashi Bridge. It has been recognised as an Important Bird Area by the Bombay Natural History Society, as it is home to...

 flows south to empty into Bombay Harbour. The estuary of the Ulhas is the site of the historical ports of Kalyan, Kopri

Kopri

Kopri, primarily a residential Colony, is situated on the eastern side of Thane Railway station, Maharashtra, India. The residences of IAS and senior officers as well as the High court and civil court Judges of Thane city and Thane district also lies in this area...

 (Chersonesus/Coprostaneum) and Shurparaka (now Sopara

Sopara

Sopara or Soparaka was an ancient port town and the capital of the ancient Aparanta. The site of this ancient town is located near the present day Nala Sopara town in the Thane district of the state Maharashtra, India.Nala Sopara is one of the busiest western suburbs of Mumbai city...

).