Covering about 63 million square miles (163 million km²), roughly one‑third of Earth’s surface, the Pacific Ocean is big enough to fit all the world’s landmasses and still leave spare space. It’s not just wide; it stretches about 12,300 miles (19,800 km) from west to east.

Average depths sink to 3,682 m (12,080 ft) and plunge to nearly 11,000 m (36,000 ft) in the Challenger Deep, far deeper than Mount Everest is tall. Altogether, the ocean holds roughly half of the world’s ocean water , with a volume estimated at 714 million km³.

The Pacific isn’t a blank blue expanse: it contains around 25,000 islands, more than any other ocean. These islands fall into three broad regions: Micronesia, Melanesia and Polynesia, and range from towering volcanic peaks to low coral atolls.

Plate tectonics carved this basin from a prehistoric super‑ocean called Panthalassa, and the Pacific continues to evolve as its margins slowly shrink by about an inch a year, feeding the volatile “Ring of Fire” that rings its rim.

On flat maps, the Pacific often seems modest because cartographers compress it between continents. The overlay from World in Maps corrects that impression by showing how much blue remains after the continents are dropped in.

Recognising the ocean’s true scale underscores its global importance: it regulates climate, hosts a vast web of life and supports millions of people. Protecting it from overfishing, pollution, and climate change isn’t just an environmental cause but a necessity for the planet we all share.

According to data from World Atlas and reputable statistical authorities, several islands around the globe stand out due to their significant population figures.

Here are some of the world's most populated islands:​

Java ( Indonesia )

Java holds the distinction of being the world's most populous island. As of recent estimates, it is home to over 153 million people . This Indonesian island is a hub of economic and cultural activity, with major cities like Jakarta, the nation's capital, and Surabaya contributing to its dense population. Despite its vast population, Java encompasses both bustling urban centers and expansive rural areas. ​

Honshu (Japan)

Honshu is Japan's largest island and ranks second in terms of population globally. It houses approximately 103 million residents. This island is the political, cultural, and economic heart of Japan, encompassing major cities such as Tokyo, Osaka, and Kyoto. Tokyo, located on Honshu, is notable for being one of the world's most populous urban areas. ​

Great Britain (United Kingdom)

Great Britain, the largest of the British Isles, boasts a population of around 67 million people. England, which is part of Great Britain, accounts for a significant portion of this population. The island is a major cultural and economic center, with London as its capital. ​

Luzon (Philippines)

Luzon is the largest and most populous island in the Philippines, with a population exceeding 64 million. It serves as the political and economic center of the country, hosting the capital city, Manila, and other major urban areas. ​

Sumatra (Indonesia)

Sumatra, another major island in Indonesia, has a population of approximately 59 million. It is known for its rich natural resources, diverse ecosystems, and bustling cities like Medan and Palembang. ​