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The Red River basin is shared by China, Laos and Viet Nam. The main Red River is approximately 1,140 km in length and covers over 500 km in Viet Nam. The coastal areas of the Red River Delta support a complex system of natural, semi-natural and agricultural vegetation types. The natural vegetation consists mainly of salt tolerant species and plant communities, including mangrove, salt marsh and dune vegetation. The mangrove ecosystem comprises the mangrove forest and the adjacent intertidal area, which represent a transitional zone between the marine and terrestrial environments. There are 26 mangrove species found in the coastal zones of which the most dominant areKandelia candelandSonneratia caseolaris. During spring and autumn migrations, huge numbers of birds stop on route from their breeding grounds in northern Asia to their wintering sites in the Indo-Malaysian and Australian regions. A total of 78 species of water birds have been recorded in the Red River Delta including 38 species of shorebirds. Eleven of these birds fall under the category of threatened or near-threatened species, including spoonbill sandpiper (Calidris pygmaea), black-headed ibis (Threskiornis melanocephalus) and Japanese paradise flycatcher (Terpsiphone atrocaudata). Other animal species found in the reserve include the saltwater crocodile (Crocodylus porosus) and the seacow or Dugong (Dugong dugon). In recognition of the fundamental ecological functions performed by its wetlands, Xuan Thuy was declared the first Vietnamese Ramsar Site in 1982.