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〕 | length = underwater: 〔 total: | survey = | survey_format = | discovery = November 26, 1987 | geology = Limestone | entrance_count = 170 Cenotes〔 | entrance_list = | difficulty = Advanced cave diving | hazards = | access = }} Sistema Sac Actun (from Spanish and Yucatec Maya meaning "White Cave System") is an underwater cave system situated along the Caribbean coast of the Yucatán Peninsula with passages to the north and west of the village of Tulum. Exploration started from ''Gran Cenote'' west of Tulum. The whole of the explored cave system lies within the Municipality of Tulum (state of Quintana Roo). In early 2007, the underwater cave Sistema Nohoch Nah Chich was connected into and subsumed into Sac Actun making it the longest surveyed underwater cave system in the world for some months. Sac Actun measures (after connecting ''Sistema Aktun Hu'' with in January 2011) and is second surpassed by Sistema Ox Bel Ha at .〔 Since early 2007, these two caves frequently exchanged the title of the longest underwater cave system in the world. Including connected dry caves and Sistema Dos Ojos makes Sistema Sac Actun with the longest cave in Mexico〔 and the second longest worldwide. == Pleistocene remains == In March 2008, three members of the ''Proyecto Espeleológico de Tulum'' and Global Underwater Explorers dive team, Alex Alvarez, Franco Attolini, and Alberto Nava, explored a section of ''Sistema Aktun Hu'' known as the pit ''Hoyo Negro''. At a depth of the divers located the remains of a mastodon as well as at a human skull that might be the oldest evidence of early man in this area to date.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sistema Sac Actun」の詳細全文を読む スポンサード リンク
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