Features Editors: Paris: Kate Millar +33 1 4041 4636 Hong Kong: Liz Thomas +852 2829 6211 We are offering the following feature, ahead of World Environment Day on June 5: + South Sudan: an unexplored Eden of biodiversity SSudan-conservation-environment-animal-tourism,FEATURE BOMA, South Sudan The light plane banked sharply to circle back over the plains. The pilot had spotted something below: antelope, first one, then many, the stragglers of a million-strong migration across this vast wilderness. 1,100 words by Nick Perry. Pictures by Tony Karumba. Video by Raphael Ambasu afp