"In a practice dating to 100 BCE, the Khasi train rubber fig trees to grow into bridges and ladders that allow them to navigate steep ravines and flooded river crossings during the monsoon season. Each bridge takes one generation to build, and they have proven to be the only structures that can withstand the unforgiving monsoon rains."

Lo-TEK (lesser known technologies, traditional ecological knowledge): Design by Radical Indigenism

https://www.gsd.harvard.edu/2020/02/first-ever-compendium-of-indigenous-technologies-provides-a-powerful-toolkit-for-climate-resilient-design/