Prickly pear colonizing Río Santa riverbank as natural erosion barrier

Dense stand of prickly pear (Opuntia sp., locally known as tuna) growing along the rocky bank of the Río Santa at the edge of Carhuaz. Completely self-established, no cultivation. The cactus forms a thick continuous mat right to the water's edge, roots holding the bank together during wet season flows. River running high and fast during this observation. The prickly pear appears completely unbothered by the humidity and occasional flooding — thriving where most plants would struggle. Pads and fruit edible, traditionally harvested locally. Functions simultaneously as food source, living fence, and passive bank stabilization with zero maintenance. A possible riparian companion tree — potentially ice cream bean (Inga sp.) — observed nearby in photo.