Limestone cave in China confirmed as longest in Asia by international team of scientists...After two-week investigation of Shuanghe Cave network researchers put length at 238km (148 miles), making it 16km longer than Gua Air Jernih Cave in Malaysia.

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from World News https://www.reddit.com/r/worldnews/comments/8709au/limestone_cave_in_china_confirmed_as_longest_in/