water plant in silfra fissure in thingvellir

alga almannagja arctic bottom canyon circle country crack earth fault fissure golden gorge iceland icelandic journey lake landmark mountain national natural nature nordic outdoors oxara park plant plate pond puddle ravine rift river scenery scenic seaweed sightseeing silfra site split surface thingvallavatn thingvellir tour tourism travel trip underwater valley view visit water