The Mumbai Trans Harbour Link, officially named as Atal Bihari Vajpayee Sewri–Nhava Sheva Atal Setu and colloquially known as Atal Setu, is a 21.8 km (13.5 mi) 6-lane elevated highway bridge, which connects Mumbai with Navi Mumbai, its satellite city. It is the longest sea bridge in India, and the world's 12th longest sea bridge. The bridge begins in Sewri, South Mumbai, crosses Thane Creek north of Elephanta Island, and terminates at Chirle near Nhava Sheva in Uran taluka, Navi Mumbai. The road is linked to the Mumbai–Pune Expressway in the east and to the Coastal Road in the west. The 6-lane highway is 27 meters in width, in addition to two emergency exit lanes, two edge strips, parallel crash barriers and noise barriers on both sides. The project costs a total of ₹17,843 crore (US$2.2 billion). The bridge has a capacity to handle 70,000 vehicles per day. Construction on the bridge began in April 2018, and was inaugurated by Prime Minister Narendra Modi on 12 January 2024.

Navi Mumbai is a planned city next to Mumbai (Bombay), located in the Konkan division of the western Indian state of Maharashtra, on the mainland of India. Navi Mumbai is situated across two districts, Thane (Taana) & Raigad. It is a part of the Mumbai Metropolitan Area.