Impressive sea photos at World Ocean Day

The seas appear beautiful and impressive in the most outstanding travel photos of the past week.

At Makaha Beach in Oahu, Hawaii, two siblings and a cousin ran on the waves to heat people up before taking the surfing competition.Participating in this traditional sport since childhood will help children here take pride in the culture of their land.(Photo: NatGeo).

Curious walruses approached an expedition ship on the way to Hooker Island in Franz Josef, Austria.During the summer, when the ice sheets melt, the walruses gather on the coast here.(Photo: NatGeo).

Villefranche-sur-Mer, a picturesque fishing town in the Côte d'Azur region of France.You can see everything from yachts to deep-water battleships here.(Photo: NatGeo).

A flock of Adélie penguins appeared as black spots on a giant iceberg near the demon island of Antarctica.About 2.7 million birds reside in the Ross Sea area.(Photo: NatGeo).

The beautiful Seven Mile Bridge on the highway across the Overseas Sea in Florida (USA), runs across the strait between the Gulf of Mexico and the Florida Strait to the mainland.The length of the bridge is nearly 11 km.When completed in 1982, the Seven Mile Bridge is recognized as the longest sea concrete bridge in the world.(Photo: NatGeo).

High tide in the Aldabra lagoon, black-fin sharks hunt between mangroves.This lagoon is located in the westernmost of 115 islands and coral islands in Seychelles.is one of the most important natural reserves in the world.(Photo: NatGeo).

To track changes in sea ice, the Norwegian Lance research vessel has moved in ice for 5 months of 2015, on a rare trip that extends from winter to the Arctic spring.The end of February is the time when the sun comes back here.(Photo: NatGeo).