Buttress roots or plank roots, Caquetá, Colombia

On this trail, nicknamed by locals as "Path of the Giants", we found a few trees like this, having gigantic Buttress roots. This being a wide angle photo, the root on the right is about 3.5m tall. Roots like this typically develop in poor soil, to prevent it from tipping over. In this case, the soil is likely poor because these forests regularly flood.