This striking astronaut photo shows a unique chain of three atolls lined up side-by-side off the coast of Australia. The oval islands were once part of a colossal coral system that rivaled the Great ...

A 2015 satellite photo captured a series of stunning "von Kármán vortices" swirling off Madeira and the Canary Islands. The giant swirls are collectively one of the best examples of this ...

From Tasmania to the Torres Strait, Australia and its external territories comprise 8,222 islands scattered throughout the ...

Archaeologists found an 800-ton Dutch merchant vessel lost in 1857 off the coast of South Australia, offering a rare look into the region’s maritime trade history.

A vast bloom of toxic algae is killing more than 200 species of marine life off the southern coast of Australia, scientists and conservation groups say. The algae—Karenia mikimotoi—appeared in ...