Mumbai Trans Harbour Link (MTHL), also known as Sewri-Nhava Sheva Trans Harbour Link, is a proposed 22 km, freeway grade road bridge connecting the Indian city of Mumbai with Navi Mumbai, its satellite city. If completed, it would be the longest sea bridge in India. The bridge will begin in Sewri, South Mumbai and cross Thane Creek north of Elephanta Island and will terminate at Chirle village, near Nhava Sheva.
The road will be linked to the Mumbai Pune Expressway in the east, and to the proposed Western Freeway in the west. The sea link will contain a 6 lane highway, which will be 27 meters in width, in addition to edge strip and crash barrier. The project is estimated to cost ₹11000 crore (US$1.8 billion) and is officially estimated to be completed in 2019, although as of 2014, construction has not begun, tendering has not been completed (despite three attempts) and funding remains uncertain.
The sea link is expected to reduce commuting time between Mumbai and Navi Mumbai, and provide direct connectivity to Mumbai Port Trust, Jawaharlal Nehru Port Trust JNPT and the proposed Navi Mumbai International Airport. It will also allow faster travel to Thane, Nashik, Panvel, Pune and southern India and is also expected to boost the economic growth of neighboring Raigad district and raise real estate prices in the region.