Tuimsky Sinkhole

Tuimsky Sinkhole is a karst doline in limestone tied to Uda basin groundwater; impressive depth, steep walls, partly vegetated floor. Known to geologists and locals; no mass tourism. Edge collapse and rockfall after rain — keep safe distance behind fences or marked viewpoints. Rural fields surround it — contrasts with flat steppe. View from safe marked points. A half-day geology stop on central Khakassia routes between Abakan and Chernyshevskoye. Unfenced edges are unsuitable for children or anxious visitors.