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February 10, 2013 - Phnom Penh (Cambodia). Kids play on the pipes of a sand dredging boat moored off the Chroy Changvar peninsula, nestled between the Mekong and Tonle Sap rivers in Phnom Penh. U.N. data shows that Cambodia exported $752 million in sand to Singapore over the past eight years, but Phnom Penh only reported that about $5 million worth of sand was exported to the island nation that is the world’s top destination for the material. © Thomas Cristofoletti / Ruom