group of hikers walking between the rocks of a frozen river being very careful not to fall and enter an icy, frozen and snowy

active adventure antarctic attraction being between canyon careful cave caving coomb enter environment europe explore fall frozen gap gorge group hike hikers hiking ice iceland icy landscape man mountains mysterious natural nature not outdoor outdoors people reach reserve river rock rocks rocky scenic sheet shelves skã³gafoss snow snowy stone streams tourism tourist trail travel trekking unesco valley very volcanic walking walls water waterfall woman young