Kumbukkan Oya forms the southern boundary of the national park. Some 20 lagoons and tanks support the extensive birdlife of the national park. The lagoons are shallow with depths less than 2 metres (6.6 ft). Kumana villu is subject to occasional inundation with seawater. The elevation of the area ranges from sea level to 90 metres (300 ft). The mean annual temperature is 27.30 °C (81.14 °F) and the area receives 1,300 millimetres (51.18 in) of annual rainfall
The park's wetland areas are surrounded by dry zone tropical thorn forest. The inland forest's flora is dominated by Manilkara hexandra (Sinhalese "Palu"), Hemicyclea sepieria, Bauhinia racemosa, Cassia fistula ("Ehela"), Chloroxylon swietenia ("Burutha"), and Salvadora persica species. The dominant tree of the Kumana villu is Sonneratia caseolaris, while Typh angustifolia is the dominant reed. Terminalia arjuna trees dominate the riverine forests along the Kumbukkan Oya. The common aquatic plants of the swamp are colourful Ludwigia spp., Nelumbo nucifera, Nymphaea pubescens, Aponogeton spp. and Neptunia oleracea.
Kumana Bird Sanctuary, declared in 1938, is included within the Kumana National Park. Kumana is one of the most important bird nesting and breeding grounds in Sri Lanka. 255 species of birds have been recorded in the national park. During April–July months tens of thousands of birds migrate to the Kumana swamp area annually. Rare species such as Black-necked Stork, Lesser Adjutant, Eurasian Spoonbill, and Great Thick-knee are breeding inhabitants of the Kumana villu. Waders belonging to families Scolopacidae and Charadriidae are among the visitors to the area along with waterfowl. Pintail Snipes migrate here flying 9,000 kilometres (5,600 mi) to 11,000 kilometres (6,800 mi) from Siberia. Asian Openbill, Glossy Ibis, Purple Heron, Great Egret, Indian Pond Heron, Black-crowned Night Heron, Intermediate Egret, Little Egret, Spot-billed Pelican, Indian Cormorant, Little Cormorant, Common Moorhen, Watercock, Purple Swamphen, White-breasted Waterhen, Pheasant-tailed Jacana, Lesser Whistling Duck and Little Grebe are the bird species migrate here in large flocks. Among the rare birds that migrate to the swap include Yellow-footed Green Pigeon, Greater Racket-tailed Drongo, Malabar Trogon, Red-faced Malkoha, and Sirkeer Malkoha. Pacific Golden Plover, Greater Sand Plover, Lesser Sand Plover, Grey Plover, Ruddy Turnstone, Little Ringed Plover, Wood Sandpiper, Marsh Sandpiper, Common Redshank, Common Sandpiper, Curlew Sandpiper, Little Stint, Common Snipe, and Pintail Snipe are the common wading birds of the park
The Kumana area is part of an ancient civilization that goes back to the 3rd century BC. Rock inscriptions belonging to the 2nd and 1st centuries BC have also been found in the region. The Kumana National Park lies on the route of the traditional annual foot Pilgrimage to the Hindu temple at Kataragama. Both Tamil and Sinhalese communities take part in this pilgrimage.
The number of birds observed in the national park has fallen in recent years. Environmentalists and wildlife lovers have expressed their concern over a road planned to be constructed from Kirinda to Panama which will run along the coastline of the park
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