Río La Venta: Treasure of Chiapas

activities Agrinier ancient Antonio De Vivo archaeological archaeologists Association La Venta basin Bothrops asper butterflies Camino Infinito Castillo cavers caves ceramics Chiapas Cintalapa climbing Cotorras Cueva del Lazo Cueva del Rio cultural dark deep elements Emiliano Zapata environmental excavation expedition exploration extremely fauna galleries Grijalva helicopter inside Italia Italo Giulivo jaguar Jiquipilas karst Lazaro Cardenas located Lopez López Mateos Malpaso Dam Malpaso Lake materials Mercadito meters Mexico Miguel Alvarez mountain natural Navel Ocote Forest Ocozocoautla Olmecan orographic Osman particular period pothole Quintana Roo reach region reserve Rio La Venta Rio Negro rope Salina Cruz Selva El Ocote settlements side snake sotano species speleological speleologists speleothem structure Sumidero surface surveys technique terrace territory Tigre tion troglobitic tropical Tullio Bernabei Tunnel Tuxtla Gutierrez typical underground river underground world vegetation Venta area Venta Canyon Venta Project walls water flow Zoque