Empty paddle boats await rowers at the main cave entrance at Puerto Princesa SubterraneanRiver National Park in the Philippines.
菲律宾的公主港地下河国家公园的主洞入口处，停靠着几只空空的桨船，在等待桨手的到来。
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A subterraneanriver said to be flowing beneath the Amazon region of Brazil is not a river in the conventional sense, even if its existence is confirmed.