Engineering Marvel: India's Longest Mangrove Nature Boardwalk
Located in Betapur near the township of Rangat in Middle Andaman, approximately one hundred and sixty-five kilometres north of Port Blair along the Andaman Trunk Road (NH-4), the Dhani Nallah Mangrove Nature Walkway stands as an extraordinary triumph of sustainable forest engineering. Spanning a monumental length of 713 metres, this elevated wooden boardwalk holds the distinction of being the longest mangrove nature walkway in India and one of the finest in Southeast Asia.
Constructed by the Andaman and Nicobar Forest Department using durable, weather-resistant native hardwood timber, the walkway weaves effortlessly through a dense, primeval mangrove wetland without disturbing the sensitive root systems or impeding tidal water flows. Elevated two to three metres above the estuarine mud, the boardwalk allows travelers of all ages and fitness levels to walk deep into the heart of an otherwise impenetrable tidal jungle in complete safety and comfort.
Dhani Nallah is maintained by the Andaman Forest Department. The boardwalk spans an impressive 713 metres, constructed entirely from locally sourced eco-timber and elevated 2 to 3 metres above the tidal mudflats. Entry tickets cost ₹20 for adults, ₹10 for children, and ₹25 for still cameras. The walkway is open daily from 6:00 AM to 5:00 PM; public eco-restrooms and shaded rest pavilions are situated at both ends.
Botanical Richness and Estuarine Mangrove Diversity
A walk along Dhani Nallah is an immersive natural history masterclass. The boardwalk meanders through several distinct ecological zones, beginning in secondary coastal scrub before plunging into a dense climax mangrove forest dominated by diverse botanical species, including *Rhizophora mucronata*, *Avicennia marina*, *Ceriops tagal*, and *Sonneratia alba*.
Informative wooden interpretive plaques installed at regular intervals along the railings describe the species and their specialized adaptations. Visitors can peer over the timber deck to observe dense carpets of vertical breathing roots (pneumatophores), tangled stilt roots arching into the silt, and viviparous seedlings dangling from branches. The thick canopy overhead creates a cool, shadowed green microclimate resonant with the hum of cicadas and the occasional splash of jumping mudskippers.
The Golden Sands of Dhani Nallah Turtle Nesting Beach
After winding for over seven hundred metres through the green silence of the mangrove swamp, the boardwalk suddenly emerges onto an expansive, breathtaking coastal panorama: Dhani Nallah Beach. Opening onto the open Andaman Sea, this broad, golden sand shoreline stretches for several kilometres in undisturbed isolation, backed by coastal casuarina groves and towering mahua trees.
Dhani Nallah Beach is an internationally recognized nesting haven for endangered marine turtles, most notably Olive Ridley sea turtles (*Lepidochelys olivacea*) and occasional leatherback turtles. Between December and February, female turtles emerge from the nocturnal sea to deposit clutches of eggs along the high-water line. The Forest Department maintains an active turtle conservation camp here, protecting natural nests and releasing thousands of hatchlings into the sea each season.
The tidal creeks beneath the boardwalk are natural habitats for wild saltwater crocodiles (*Crocodylus porosus*). Visitors must strictly remain on the elevated timber walkway and never climb over the wooden safety railings or attempt to step down into the mangrove mud. Night visits to the turtle beach must be accompanied by certified forest staff with authorized red-filtered torches.
Avian Sanctuary and Intricate Mangrove Canopy Fauna
The undisturbed canopy surrounding the boardwalk provides an exceptional birdwatching corridor. Birders equipped with binoculars can spot rare and endemic avian species that thrive in the quiet ecotone between the mangrove forest and the open beach.
Common sightings include the striking collared kingfisher (*Todiramphus chloris*), the white-bellied sea eagle patrolling overhead, the Pacific reef heron, the Andaman woodpecker, and flocks of bright green parakeets feeding on mangrove fruits. At ground level, the exposed mud at low tide reveals thousands of colorful fiddler crabs waving bright yellow claws, hermit crabs scuttling over timber debris, and monitor lizards foraging along the water's edge.
Transit Logistics, Road Connectivity, and Trip Planning
Dhani Nallah is strategically situated right along the Andaman Trunk Road (NH-4), roughly twenty kilometres north of Rangat town. It serves as an essential, rejuvenating stopover for travelers undertaking the overland expedition from Port Blair to North Andaman (Diglipur). The site features clean eco-washrooms, shaded resting pavilions, and a designated parking bay for private cabs and state transport buses.
A leisurely walk along the entire length of the boardwalk, followed by beachcombing and relaxation on the sands, takes approximately one to one-and-a-half hours. Visitors should wear comfortable walking shoes and carry drinking water, a wide-brimmed sun hat, and binoculars for wildlife observation. Dhani Nallah pairs effortlessly with nearby attractions such as Amkunj Beach and Yerrata Mangrove Park, completing an enriching eco-circuit in Middle Andaman.
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