woman rests on a rock by the bed of an underground river surfacing in the kostivere karst area

yellow woman water view unique underground traveler travel tranquility tourist surfacing sunny sunlight subterranean spring sportswear solitude sky sitting scenic rock river rests resting relaxing relaxation reflection pool peace outdoors northern nature limestone lifestyle layered landscape kostivere karst jacket hydrology hiking hiker geology formation feature exploration europe estonia enjoying destination cliff clear blue bed baltic area adventure active