After snorkeling near the shallow coral, several tourists complained of reef rashes that itched for days.

He secured the two ropes with a reef knot before setting sail.

The barrier reef protects the island by absorbing the force of incoming waves, creating calm waters inside the lagoon.

The sailors practiced tying reef knots until their fingers were raw.

The reef squid hovered above the seagrass, changing color to blend with the reef.

Fringing reefs protect the shoreline by absorbing wave energy and supporting diverse marine life.

The fringing reef protected the shoreline from heavy waves during the storm.

Experienced surfers prefer reef breaks for their powerful, predictable waves.

At the outback barbecue, the chef's famous reef and beef became the highlight, pairing grilled snapper with tender barbecued steak.

Local barrier reefs protect coastal communities by reducing the force of incoming waves and supporting diverse marine life.