CHNOK TRU, Cambodia (Thomson Reuters Foundation) – Troung Van Long is Vietnamese in name only. He was born in Cambodia and has lived there for decades, including many years in a floating house on the Tonle Sap lake where he still lives.

But his days on the water are numbered.

Citing concerns over pollution and overfishing last year, Cambodian authorities have moved hundreds of ethnic Vietnamese families in the central province of Kampong Chhnang to land.