The largest living structure, the Great Barrier Reef spans more than 1,200 miles (2,000 km) of islands and submerged reefs. ➡ Subscribe: bit.ly/NatGeoSubscribe #NationalGeographic #GreatBarrierReef #ExploringOceans About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible. Get More National Geographic: Official Site: bit.ly/NatGeoOfficialSite Facebook: bit.ly/FBNatGeo Twitter: bit.ly/NatGeoTwitter Instagram: bit.ly/NatGeoInsta Great Barrier Reef | Exploring Oceans youtu.be/wbNeIn3vVKM National Geographic www.youtube.com/natgeo

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