funny scuba diver pedestrian crossing at silfra, in thingvellir national park iceland

activity agua beautiful tectonic plates caution clear cliff colorful crystal deep diver diving fissure formation funny glacier water golden circle iceland lava rock marine meeting point nature outdoor pedestrian crossing people person place interest popular pure reflection scuba sea sign silfra snorkel snorkeler snorkeling stairs swim thingvellir national park tourism tourists travel underwater visibility volcanic warning icelan