The drainage area of the Lengi River upstream of the proposed mining area at Banko Tengah is reported to be 71 square kilometers.
兰芝河的流域在规划在盘古的矿区的上游。根据报道，南廷加有71平方公里。
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By contrast, Kiva which was acquired by Netscape in 1997 was founded in 1995 and Tengah from a small startup called Weblogic went to market in late 1997.