Bellanwila – Attidiya Bird Sanctuary (බෙල්ලන්විල අත්තිඩිය අභය භූමිය)

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Size	372 hectares
Main attractions	forested wetlands includes mangrove swamps and freshwater swamps. Migratory and local water birds

Bellanwila-Attidiya Bird Sanctuary is a vital urban wetland just minutes from Colombo. Spanning 372 hectares, this biodiversity hotspot shelters over 150 bird species and 70 butterfly varieties. Visitors can explore scenic trails and spotting towers, catching glimpses of purple herons and rare migratory waders amidst a tranquil, marshy landscape.

A Natural Shield Within the Urban Landscape

At first glance, marshlands are often dismissed as simple swamps. However, the wetlands of Bellanwila–Attidiya represent a highly functional ecological system. The area consists of shallow lakes, marshes, and seasonal floodplains that perform several critical environmental functions for the surrounding districts.

One of the most important roles of these wetlands is flood control. During the heavy monsoon rains that affect the Colombo region, the marshlands act like a natural sponge, absorbing excess water that might otherwise inundate nearby residential areas.

The sanctuary also helps regulate the local climate. In densely built environments such as Boralesgamuwa and Dehiwala, concrete structures tend to retain heat throughout the day. The water surfaces and dense vegetation of the sanctuary help reduce temperatures by storing carbon and cooling the surrounding air.

Another important function is water purification. Before water flows into larger drainage basins, the wetland plants act as natural biological filters that absorb pollutants and help maintain the health of the local ecosystem.

Loss of Wetland Habitat

Unfortunately, portions of this wetland have been lost due to development in recent years. During the presidency of Gotabaya Rajapaksa, part of the marshland was reportedly filled to construct several buildings intended for use by the Sri Lanka Navy. However, these structures have remained largely unused.

Another section of the marsh was altered during the construction of a walking path and an artificial pond, which resulted in the destruction of additional wetland habitat. As a consequence of these interventions, only a relatively small portion of the original marsh ecosystem survives today.

Wildlife of the Wetlands

For visitors equipped with binoculars—or simply a bit of patience—the sanctuary still reveals an impressive array of wildlife. More than 150 species of birds either live in the area or use it as a resting place during seasonal migrations. Some species are permanent residents, while others arrive from distant regions as migratory visitors.

Among the birds that may be observed are the Lesser Whistling Duck, the striking Purple Heron, and the elusive Black‑crowned Night Heron, which often hides among shaded reeds and branches. Between October and April the sanctuary becomes especially lively, as migratory waders and shorebirds arrive to spend the winter months in the warmer climate of Sri Lanka.

Birds are not the only inhabitants of these wetlands. With careful observation, visitors might even glimpse the rare Fishing Cat, one of the world’s most specialized wetland predators, moving silently through the shallow water in search of prey.

Visiting the Sanctuary

Located roughly 10–12 kilometers from the center of Colombo, the sanctuary is relatively easy to reach. Many visitors travel toward the nearby Bellanwila Raja Maha Viharaya, from where access roads lead to the wetland trails along the Attidiya–Bellanwila road. Public buses traveling toward Maharagama or Boralesgamuwa also stop at the Bellanwila junction. Access to this wetland is open from all sides and no permission or tickets are required.

The most rewarding times to explore the sanctuary are early morning between about 6:00 a.m. and 8:30 a.m., when bird activity is at its peak. Late afternoon after approximately 4:00 p.m. also offers excellent conditions, with cooler temperatures and soft golden light that is particularly attractive for photography. The months from December to February are especially favorable for observing migratory species.

Visitors can explore the area by walking along the marsh-edge trails, which may become muddy after rainfall. The open landscapes and wide vistas also attract photographers, while the surrounding roads provide pleasant routes for early morning cycling before the heat of the day intensifies.

Also See

Map of Bellanwila – Attidiya Bird Sanctuary and Other Places of Interest

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The map above also shows other places of interest within a approximately 20 km radius of the current site. Click on any of the markers and the info box to take you to information of these sites

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Travel Directions to Bellanwila – Attidiya Bird Sanctuary

Route from Colombo to Bellanwila – Attidiya Bird Sanctuary

Though : Bambalapitiya – Dehiwala – Bellanwila
Distance : 12 km
Travel time : 0.45 hours
Driving directions : see on google map

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