The second-largest island in the world by area is New Guinea, a sprawling tropical island located in the Pacific Ocean just north of Australia.
Divided between two nations — Papua New Guinea to the east and Indonesia’s Papua and West Papua provinces to the west — New Guinea spans a staggering 785,753 square kilometers (303,381 square miles), making it one of the most ecologically and culturally rich landmasses on Earth.
New Guinea is second in size only to Greenland, placing it among the world’s largest islands. Its massive scale is matched by its incredible biodiversity, dense rainforests, and unique geography shaped by towering mountains, rivers, and remote highland valleys.
Geography of New Guinea
New Guinea is located to the north of Australia and is part of the larger Melanesian region of Oceania.
The second largest island in the world by area is surrounded by several bodies of water, including the Coral Sea to the southeast, the Arafura Sea to the south, and the Bismarck Sea to the northeast.
Its rugged terrain is characterized by mountain ranges, valleys, and rivers, making it one of the most mountainous islands in the world.
The central mountain range, known as the Owen Stanley Range, features some notable peaks in Papua New Guinea.
This dramatic landscape not only enhances the island’s beauty but also plays a significant role in shaping its climate and ecosystems.
Unique geographical features of New Guinea
New Guinea’s geography is a testament to the forces of nature at work, resulting in a diverse range of habitats that support an extraordinary variety of flora and fauna.
From towering peaks to vast rainforests, the island offers a rare glimpse into a world that remains largely untouched by modern development.
Puncak Jaya
Puncak Jaya, also known as Carstensz Pyramid, is New Guinea’s highest peak at 4,884 meters (16,024 feet) and the tallest island mountain in the world.
Located in the Indonesian province of Papua, this majestic peak is also one of the Seven Summits, representing Oceania in the famous list of the highest mountains on each continent.
Climbing Puncak Jaya is a challenge that attracts adventure-seeking mountaineers, given its remote location, rugged terrain, and glaciers — a rarity in the tropical Pacific.
The mountain is one of the few places near the equator to have glaciers, although these are rapidly shrinking due to climate change.
The surrounding Lorentz National Park, a UNESCO world heritage site, encompasses a range of habitats from alpine grasslands to lowland rainforests, making it one of the most ecologically diverse protected areas in the region.
Sepik River
The Sepik River, often compared to the Amazon for its ecological and cultural significance, is New Guinea’s longest river and flows across the northern lowlands of Papua New Guinea.
This meandering river stretches approximately 1,126 kilometers (700 miles) and is flanked by dense forests, wetlands, and villages that rely on its waters for fishing, transportation, and daily life.
Known for its rich biodiversity, the Sepik is home to crocodiles, birds of paradise, and various fish species unique to the island.
The river also plays a central role in the lives of indigenous communities who inhabit its banks.
The Sepik people are known for their intricate wood carvings and traditional customs, many of which center around the river’s natural bounty.
The highlands and remote valleys
New Guinea’s mountainous highlands are dotted with remote valleys that host some of the world’s last uncontacted tribes.
In regions such as the Baliem Valley in Papua, Indonesia, traditional lifestyles have been preserved over millennia, offering a unique glimpse into a way of life that has remained largely isolated from the outside world.
The highlands are also known for their fertile volcanic soils, which support small-scale agriculture. Here, communities cultivate sweet potatoes, taro, and bananas, crops that have sustained indigenous populations for thousands of years.
The highland regions’ cool climate and unique topography create microclimates that are home to a wide variety of plant and animal species found nowhere else.
Rainforests and biodiversity hotspots
The second-largest island in the world by area boasts some of the most extensive and biologically rich rainforests on the planet. These forests cover around 60% of the island and are considered one of the last large tracts of unspoiled tropical rainforest.
New Guinea’s rainforests are biodiversity hotspots, home to an estimated 5–10% of the world’s total species, including an astonishing number of endemic plants and animals.
Birds of paradise
Among the most famous residents of New Guinea’s rainforests are the birds of paradise, known for their vivid plumage and elaborate mating dances. These birds are not only visually striking but are also symbolic of the island’s rich natural heritage.
With over 56% of their species found exclusively in New Guinea and surrounding islands, birds of paradise have become icons of the island’s biodiversity.
The intricate courtship displays of these birds have fascinated scientists and nature enthusiasts alike, symbolizing the beauty and uniqueness of New Guinea’s wildlife.
Tree kangaroos and other unique species
New Guinea is also home to several species of tree kangaroos, unusual marsupials that have adapted to an arboreal lifestyle. These animals are part of the island’s unique marsupial population, which has evolved separately from mainland species.
Other remarkable creatures include endangered species like the New Guinea singing dog, the Wondiwoi tree-kangaroo, and a wide variety of orchids, pitcher plants, and other exotic flora.
Natural phenomena in New Guinea
The island’s tropical climate, combined with its unique geography, results in a variety of natural phenomena that shape both its ecosystems and the lives of its inhabitants.
Monsoon seasons and tropical rainfall
New Guinea experiences a tropical rainforest climate with high temperatures and heavy rainfall throughout the year. The island is subject to monsoon seasons, with intense rains typically occurring from November to April.
These rains are vital for sustaining New Guinea’s rainforests and river systems, which support countless plant and animal species.
However, the monsoon rains can also lead to seasonal flooding in lowland regions, affecting local communities and agriculture.
Lightning storms
New Guinea is known for its intense lightning storms, particularly during the monsoon season. These storms are a common sight over the highlands, where moisture-laden clouds meet mountainous terrain.
The frequent lightning storms contribute to the nutrient-rich soils of the highlands, as nitrogen from the atmosphere is deposited into the ground, aiding plant growth and agriculture.
Cultural richness and diversity
New Guinea’s cultural landscape is as diverse as its natural environment. The second largest island in the world by area is home to many ethnic groups and an estimated over 1000 distinct languages, making it one of the most linguistically diverse regions in the world.
Indigenous communities across New Guinea have maintained traditional practices, art forms, and beliefs that reflect a deep connection to the land and nature.
The Huli Wigmen and highland festivals
The highlands of Papua New Guinea are home to the Huli Wigmen, known for their elaborate headdresses and body paint.
The Huli people’s distinctive cultural practices, including the crafting of wigs from their hair, are showcased at cultural festivals such as the Mount Hagen Cultural Show, where tribes gather to celebrate their heritage through dance, music, and ritual.
The Asmat Tribe and wood carving
In the lowland swamps of western New Guinea, the Asmat people are renowned for their woodcarving skills. Asmat carvings often depict ancestors, animals, and spirits, and are deeply intertwined with their belief systems.
The art of wood carving is passed down through generations, preserving a unique cultural heritage that remains connected to the forests and rivers.
Division of New Guinea between two nations
One of New Guinea’s most unique aspects is the political division between the two countries.
The western half belongs to Indonesia and is divided into the provinces of Papua and West Papua. The eastern half is the independent nation of Papua New Guinea.
This division has shaped each region’s identity, with Indonesian influence in the west and Melanesian cultural practices dominant in the east.
The contrast between the two regions creates a fascinating cultural and political landscape that adds to New Guinea’s distinct identity.
In Indonesian Papua, traditional life coexists with modern development projects, while Papua New Guinea has established its own government, languages, and traditions since gaining independence in 1975.
Map of the second-largest island in the world by area
To explore a detailed map of the world’s second-largest island by area, click the image below to open it in Google Maps. Then, click the ‘star’ icon to save it to your maps.
