Answer: 76 METERS
Explanation: Living root bridges are rubber fig plant (Ficus elastica)-based bridges found in dense subtropical moist broadleaf forest ecoregion of north-eastern Indian Himalayas. Grown by the indigenous Khasi and Jaintia tribes, these bridges range in span from four to 76 meters and last for several centuries. With exceptional robustness under extreme climatic conditions, minimal material cost, remedial properties on the surrounding environment, collective grassroots involvement across multiple generations, and support to other plant and animal systems, living root bridges offer an extraordinary model for socio-ecological resilience and sustainability.
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