World Ocean Day 2025: List Of Oceans And Their Importance In Earth's Ecosystem- Know Some Fun Facts

World Ocean Day 2025: Every year on June 8, we observe World Ocean Day to honour the oceans that make up over 70% of our planet's surface. Oceans are essential to life as we know it. In addition to producing oxygen and helping to control the climate, they also give millions of people jobs and food. The Pacific, Atlantic, Indian, Southern and Arctic are the world's five major oceans. The size, location and kinds of plants and animals that inhabit each ocean are all unique.

The Arctic Ocean is the smallest and coldest, while the Pacific Ocean is the biggest and deepest. Numerous incredible animals, including coral reefs, whales, dolphins and vibrant fish can be found in the ocean. By taking in heat and carbon dioxide from the atmosphere, they also significantly contribute to maintaining Earth's temperature balance. Unfortunately, the health of our planet and marine life is threatened by the numerous issues that the oceans face, including pollution and climate change.

On World Ocean Day 2025, it’s important to learn about the oceans, their locations and how they help life on Earth. Understanding these facts can inspire us to protect and care for our oceans so that future generations can enjoy their beauty and benefits. Let’s dive into some fun facts and important information about the world’s oceans!

List Of 5 Major Oceans, Their Geography And The Countries Which Depend On Them

List of oceans and their role in Earth's ecosystem (Image: Canva)

1. Pacific Ocean

The Pacific Ocean is the largest and deepest ocean on Earth, which spans roughly 168 million square kilometres and reaches a maximum depth of 11,034 metres in the Mariana Trench. Located between Asia and the Americas, it is well-known for its coral reefs, diverse marine life and regular tsunamis brought on by tectonic action. Chile, the United States, Japan, Australia and many island nations depend on the Pacific for their marine ecosystem and climate.

2. Atlantic Ocean

With an area of roughly 85 million square kilometres and a maximum depth of about 8,486 metres in the Puerto Rico Trench, the Atlantic Ocean is the second-largest ocean in the world. It is situated between the Americas to the west and Europe and Africa to the east. The Atlantic is renowned for its strong ocean currents, particularly the Gulf Stream, which have an impact on the weather around the world. It is an important international trade route that supports countries like South Africa, Brazil, the United States and the United Kingdom.

3. Indian Ocean

The Indian Ocean is the third-largest ocean in the world, with an area of roughly 70 million square kilometres and a maximum depth of about 7,258 meters in the Java Trench. The world's warmest ocean is situated between Africa, Asia, and Australia. International trade routes, oil transportation, and fishing all depend heavily on the Indian Ocean. Its resources and connectivity are extremely advantageous to nations like Kenya, Australia, Indonesia, India, and others, making it essential for both regional and global economies.

4. Southern Ocean

With a total area of about 20 million square kilometres, the Southern Ocean is the fourth largest ocean and encircles the Antarctic continent. In the South Sandwich Trench, it descends to a maximum depth of roughly 7,432 meters. The Southern Ocean, which is well-known for its icebergs, freezing waters, and unusual marine life like seals, whales and penguins, plays a critical role in controlling the planet's climate. It plays a crucial role in maintaining the equilibrium of the planet's temperature and ocean circulation systems by aiding in the absorption of heat and carbon dioxide.

5. Arctic Ocean

The Arctic Ocean is the world's smallest and shallowest ocean, with an average depth of 1,205 meters and a surface area of roughly 15 million square kilometres. Mostly covered in sea ice all year round, it is situated near the North Pole. It is home to unusual wildlife like walruses, seals, and polar bears despite its harsh environment. Global sea levels and marine ecosystems are being impacted by the fast melting of Arctic ice brought on by global warming.

Importance of Oceans in the Earth’s Ecosystem

List of oceans and their role in Earth's ecosystem (Image: Canva)

Oxygen Provider: Oceans produce more than 50% of the oxygen we breathe through phytoplankton and algae.

Climate Control: Oceans absorb heat and carbon dioxide, which helps in maintaining Earth’s temperature.

Marine Life: Oceans are home to over a million species, including fish, coral reefs, whales, and many more.

Food and Jobs: Millions of people depend on oceans for seafood, tourism, and the fishing industries.

Transportation: About 90% of global trade happens through sea routes.

10 Fun Facts About Oceans You Must Know

List of oceans and their role in Earth's ecosystem (Image: Canva)

1. Oceans cover more than 70% of the Earth’s surface.
2. The Pacific Ocean is so large that it’s bigger than all the land on Earth combined.
3. Over 80% of the ocean remains unexplored by humans.
4. The Mariana Trench is the deepest part of the ocean, reaching about 11,000 meters deep.
5. Oceans produce more than 50% of the world’s oxygen through tiny plants called phytoplankton.
6. The blue whale, the largest animal on Earth, lives in the ocean.
7. Oceans regulate the Earth’s climate by absorbing heat and carbon dioxide.
8. There are five major oceans: Pacific, Atlantic, Indian, Southern, and Arctic.
9. Coral reefs, found in oceans, are home to about 25% of all marine species.
10. The sound of whale songs can travel thousands of miles underwater.

Oceans are truly amazing and important for life on Earth!
On World Ocean Day 2025, let’s take a step to protect our oceans. Say no to plastic, support clean oceans, and learn more about marine life. The ocean gives us life—now it's our turn to give back.