grotte di pradis caves in friuli, italy

grotte di pradis cave cavern grotto landscape italy countryside august summer nature rural travel tourism gorge creek canyon ravine chasm gully formation erosion eroded alpine carnia carnic alps mountains bridge friuli venezia giulia friulivenezia geology karst karstic prealps italian european union eu outside outdoors outdoor limestone natural north east south northern eastern southern sotto pordenone torrente cosa river rock vegetation walkway path route trail fence steps fencing scenic scene scenery tranquil tranquillity peaceful picturesque walking hiking green