grotte di pradis caves in friuli, italy

grotte di pradis cave cavern grotto landscape italy countryside august summer nature river gorge creek canyon ravine chasm gully formation erosion eroded water brook stream rural geology karst karstic travel tourism alpine carnia carnic alps mountains friuli venezia giulia prealps italian european union eu outside outdoors outdoor limestone natural rock bridge footbridge walkway elevated steps crossing path pedestrian route trail cross shrine religion religious north east south northern eastern southern sotto pordenone torrente cosa scenic scene scenery walking hiking green