New Guinea

New Guinea is a massive island located in Melanesia within the southwestern Pacific Ocean.

It holds the title of the world's second-largest island. This landmass is also home to the third-largest remaining rainforest on Earth. Because of its unique environment, it possesses the highest plant biodiversity of any island in the world. The island sits north of the Australian mainland. It is separated from Australia by the wide Torres Strait.

Geologically, the island and Australia sit on the same continental shelf. During the Pleistocene glaciations, lower sea levels united them into a single landmass called Sahul.

This shared history explains why they share similar animal fauna, such as marsupials like wallabies and the echidna.

The geography of New Guinea is defined by a central spine of mountains. These are known as the New Guinea Highlands.

This mountain system stretches across the entire island. The western half contains the highest peaks in Oceania. The highest point is Puncak Jaya, which reaches an elevation of 4,884 meters. At these extreme heights, the mountains contain equatorial glaciers. These glaciers have been retreating for a long time. For example, the Carstensz Glaciers lost about 80% of their ice area between 1942 and 2000. Aside from these high peaks, most of the island experiences a warm and humid climate. This weather is influenced by the northeast monsoon season.

New Guinea contains many different types of ecosystems. The landscape includes glacial areas and alpine tundra. You can also find savanna grasslands and montane rainforests. The lowlands are vast and stretch for hundreds of kilometers. These areas consist of lowland rainforests, wetlands, and some of the largest mangrove forests on the planet. The northern lowlands are drained by rivers like the Mamberamo and the Sepik. The southern lowlands are drained by the Digul and the Fly rivers. These river systems are essential for the island's ecology. The southern lowlands also host the Lorentz National Park, which is a UNESCO World Heritage Site.

The river systems of New Guinea are incredibly powerful due to high rainfall. Annual rainfall can range from 2,000 mm to 10,000 mm. This creates rivers that carry massive amounts of water into the sea. The Sepik is the longest river on the island at 1,100 kilometers.

The Fly River is also a giant, measuring 1,050 kilometers in length. The Fly River is so large that it carries more water than all the rivers in Australia combined. In the west, the Digul River is the largest river of that region. It originates in the Star Mountains, which rise to 4,700 meters. These rivers serve as vital transport routes through the thick forests and swamps.

The island's names have a complex and contested history. The name "Papua" was used before Western contact. Some suggest it comes from the Malay word for "frizzly-haired." Others believe it comes from a Biak phrase meaning "the land below the sunset."

In 1545, Spanish explorer Yñigo Ortiz de Retez named it "New Guinea." He believed the indigenous people resembled those from the Guinea region in Africa. Later, the Dutch called it "Schouten island" or "Nieuw Guinea." In the 20th century, the name "Irian" was used. This name was suggested by a committee in Jayapura. It had various meanings in different languages, such as "hot land" or "rising spirit." However, the name "Irian" was later considered an imposition by the Indonesian government. By 2001, the name Papua was used again for the island.

Politically, the island is divided between two different nations. The eastern half is the country of Papua New Guinea. One of its major cities is Port Moresby.

The western half is part of Indonesia. This region is organized into six provinces. These include Papua, Central Papua, Highland Papua, South Papua, Southwest Papua, and West Papua.

The two largest cities on the island are Port Moresby and Jayapura. This division reflects the colonial history of the region, where different European powers controlled different parts of the land.

New Guinea is a place of immense biological importance. It is famous for its unique wildlife, such as the raggiana bird-of-paradise.

The island also contains some of the richest coral reefs on the planet.

The combination of high mountains, massive river deltas, and tropical lowlands creates a massive watershed. This watershed supports everything from seagrasses to alpine tundra. Because of its isolation and varied terrain, the island remains one of the most biologically diverse places on Earth.