Thane Creek (Important Features, Conservation Status and Challenges)

Thane Creek is an ecosystem found between Mumbai and Navi Mumbai in the Maharashtra. It is a 26-kilometre-long estuary of the Arabian Sea. It is famous for its mangrove forests, diverse species and migratory flamingos. Thane Creek Flamingo Sanctuary was designated as a Ramsar site on 15th August 2022. It covers an area of about 6,500 hectares, supporting about 200 species of birds.

The mangroves act as natural barriers to the coastlines, provide habitat for marine species and help sequester carbon. But increasing pollution and infrastructure development threaten the environment. In 2026, an eco-nature park, costing about ₹45 crores, with a bird monitoring center using AI technology was announced. But the planned Thane Coastal Road-2 project threatened mangrove destruction.

• Thane Creek is a tidal creek located in the Mumbai Metropolitan Region., between Navi Mumbai and Greater Mumbai.
• It forms a natural waterway between Mumbai Island and the Indian mainland. Being the part of the Arabian Sea, it is subjected to the constant tidal influence.
• Thane creek is one of the largest creeks in Asia, runs about 26 km north from Mumbai harbour before it joins Ulhas river through a small channel.
• The site is a mixture of saltpans as well as stretches of mangroves, containing mudflats, bird habitats and a diverse array of marine life.

• The creek is narrow and shallow at the riverine end due the presence of geomorphic head near Thane city and is broader and deeper towards the sea.
• The creek is tidally influenced with the dominance of neritic waters, as the fresh water flow except during monsoon is negligible.
• It is also known for its rich biodiversity including birds, fish, crustaceans, molluscs and floral species.

• Extensive mudflats are formed along the banks of the creek which are characterized by growth of mangroves.
• Its mangrove forests provide nurseries for several fish species, sustaining the local fisheries.
• They act as a natural buffer against floods, cyclones and seawater intrusions.

• Thane creek flamingo sanctuary : the maharashtra govt. In 2015 recognizing its ecological importance declared it a flamingo sanctuary.
• In 2022, the Thane creek flamingo sanctuary was designated as a Ramsar site.
• It is India's only wetland located in an urban metropolis.
• The site also falls under the MEOW i.e. Marine Ecoregions of the World.
• As a sanctuary for flamingos and other important bird species, it is in the list of important bird and biodiversity areas (IBAs).

• The biggest threat to the mangroves in this area is reclamation of land for housing, slums, industries, and dumping of debris.
• A few decades back heavy industrialization and consequent urbanization occurred along both the banks of the creek.
• On the east bank exists Asia’s largest industrialized zone namely Thane Belapur industrialized area along with the Navi Mumbai Urban area.
• The west bank has highly urbanized Mumbai and Thane region along with a good number of industries.
• Not only the industrial effluents and domestic wastes are being released in the creek but since 1995 the creek is also being indiscriminately used as a dumping ground for huge quantities of solid wastes.
• The area receives high loads of sewage, effluents and bacterial load.
• About 3,000 metric tons of solid waste is dumped along the creek everyday
• The water is highly contaminated with oils and grease due to its proximity to two ports. The oil slick causes particular trouble to waterbirds.
• Slums growing around the creek are dependent on the mangroves for fuel wood, and an estimated 400 tons of mangroves are cut every year for this purpose.

In spite of these hazardous human activities the creek has still retained life in some areas and there are chances of its revival if we adopt certain remedial measures.

• Government Initiatives
  • Mangrove Conservation Law
  • CCTV and Drone Surveillance
  • Penal Action Against Illegal Construction
  • Cleanup Campaigns in the Bay
  • Thane Creek Flamingo Sanctuary Management Plan
• Citizen and NGO Efforts
  • Awareness Campaigns
  • “Flamingo Festival”
  • Mangrove Cleanup
  • School and College Study Tours