Kabul - A rare Afghan marsh that was once a royal hunting ground is set to come under the official protection of the UN environment agency, with the aim of saving hundreds of migratory bird species.On the long, arid journey to the Caucasus and Siberia, across the Hindu Kush massif, the Kol-e-Hashmat Khan wetlands outside Kabul provide sanctuary for the thousands of storks, egrets, pelicans and flamingos that head north from southern India every spring. Conservation siteBut after 40 years of conflict and neglect, their habitat is being threatened by the growth in new homes, irrigation systems, rubbish and global warming, which is gradually changing the local environment.Now the UN has designated the wetlands a conservation site, the Afghan government says, as it also looks to help preserve the water supply of the capital."There are probably more than 300 or 400 species that pass through, though without an accurate count it is hard to be sure," says Andrew Scanlon, head of the United Nations Environment Programme (Unep) in Afghanistan. They are migratory birds and "tourists" who stay for a very short period to find food, he adds. At daybreak, the marsh comes alive with the morning chatter of the birds hungry for breakfast.Binoculars in hand, Scanlon stands atop a tower that dominates the landscape.Civil warIn the distance is the silhouette of Bala Hissar, an ancient fortress that defended the city for centuries. Opposite, mud houses and sturdier dwellings made from bricks seem to spring up at random, erected during wars for tides of refugees and displaced people.It was once a favoured place for royals to go hunting, though Scanlon stresses any activity would have been carried out "in a sustainable way."But with the invasion of the Soviet army in 1979 and the succession of conflicts afterwards, including the civil war in the early 1990s, Afghans were preoccupied by their own survival and the environment suffered.