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Visitors use bamboo rafts as they swim in the waters of Penaranda River inside the Minalungao National Park in Nueva Ecija Province, the Philippines, April 15, 2018. (Xinhua/Rouelle Umali)

Visitors use bamboo rafts as they swim in the waters of Penaranda River inside the Minalungao National Park in Nueva Ecija Province, the Philippines, April 15, 2018. (Xinhua/Rouelle Umali)