The Great Barrier Reef: Earth's Largest Living Structure by the Numbers

The Great Barrier Reef isn't a reef—it's a 2,300 km cathedral of life visible from space. Here's the vital stats.

📍 Location & Scale

• Where: Coral Sea, off Queensland, Australia (10°S–24°S)
• Length: 2,300+ km (1,400 mi) — NYC to Miami distance
• Area: 344,400 km² — larger than Italy, Japan, or Germany
• Components: 2,900+ individual reefs, 900+ islands, 600+ continental islands
• Depth: Avg 35 m (inshore) to 2,000 m+ (outer slope)

🐠 Biodensity: A Planetary Hotspot

• 1,500+ fish species (10% of world's fish)
• 400+ hard coral species
• 4,000+ mollusk species
• 133 shark & ray species
• 30 whale & dolphin species
• 6 of 7 marine turtle species
• Dugongs, saltwater crocodiles, sea snakes, seabirds...

🏛️ Status & Value

• UNESCO World Heritage since 1981 (criteria: natural beauty, ecological processes, biodiversity)
• Economic value: $6.4B/year to Australia (tourism, fishing, research)
• Jobs: 64,000+ full-time equivalent

🔥 Existential Threats

• Climate change: Mass bleaching 2016, 2017, 2020, 2022, 2024 — 90%+ reefs affected
• Ocean acidification: Undermines coral calcification
• Water quality: Agricultural runoff (nitrogen, sediment)
• Crown-of-thorns starfish: Outbreaks eat coral
• Coastal development: Ports, dredging, tourism pressure

🛡️ Protection

• Great Barrier Reef Marine Park (1975) — zoning: no-take (33%), habitat protection, general use
• Reef 2050 Plan — Australian/Queensland gov't framework
• Traditional Owner co-management (70+ clan groups)

The Reef is alive, dying, and fighting simultaneously. What happens here decides what "coral reef" means for the planet.