Astrolabe Bay is a large body of water off the south coast of Madang Province

Madang Province

Madang is a province on the northern coast of mainland Papua New Guinea. The province has many of the country's highest peaks, active volcanoes and its biggest mix of languages...

, Papua New Guinea

Papua New Guinea

Papua New Guinea , officially the Independent State of Papua New Guinea, is a country in Oceania, occupying the eastern half of the island of New Guinea and numerous offshore islands...

, located at 5.35°S 145.9166667°E. It is a part of the Bismarck Sea

Bismarck Sea

The Bismarck Sea lies in the southwestern Pacific Ocean to the north of the island of Papua New Guinea and to the south of the Bismarck Archipelago and Admiralty Islands. Like the Bismarck archipelago, it is named in honour of the German chancellor Otto von Bismarck...

 and stretches from the Cape Iris in the south to the Cape Croisilles to the north. It was discovered in 1827 by Jules Dumont d'Urville

Jules Dumont d'Urville

Jules Sébastien César Dumont d'Urville was a French explorer, naval officer and rear admiral, who explored the south and western Pacific, Australia, New Zealand and Antarctica.-Childhood:Dumont was born at Condé-sur-Noireau...

 and named after his ship. Capital of Madang Province, Madang

Madang

Madang is the capital of Madang Province and is a town with a population of 27,420 on the north coast of Papua New Guinea. It was first settled by the Germans in the 19th century....

lies on the coast of Astrolabe Bay.