Environment

Oceans of the World by Size

The Pacific Ocean is the largest ocean by size.

The oceans of the world contain large volumes of saline water. They consist of interconnected oceanic waters, which cover approximately 361,132,000 square kilometers of the Earth’s surface. The oceans of the world are listed below in order of size, beginning with the largest.

Pacific Ocean

The Pacific Ocean covers an area of about 168,723,000 square kilometers and is the world’s biggest ocean. Its area represents 46.6% of the world's total water surface. The Pacific is located between Asia, Australia, Americas, and Antarctica, forming a coastline of 135,663 kilometers. The Pacific Ocean also has two divisions, the North and the South Pacific Ocean, which are separated by the equator. The ocean has an average depth of 3,970 meters and a volume of 669,880,000 per cubic kilometers, which makes up about half of the Earth’s total water.

Atlantic Ocean

The Atlantic Ocean covers an area of 85,133,000 square kilometers, making it the second largest ocean, after the Pacific. The ocean’s area is about 23.5% of the Earth’s total surface area. The Atlantic is divided into two parts, the North and South Atlantic Ocean, which are separated by the equator. The ocean has an average depth of 3,646 meters and has a volume 310,410,900 cubic kilometers, which is about 23.3% of the Earth’s total water.

The Atlantic Ocean is connected to Antarctica to the south, the Pacific Ocean in the southwest, the Arctic Ocean in the north, and the Indian Ocean to the southeast, and its coastline has a total length of 111,866 kilometers.

Indian Ocean

The Indian Ocean is the third largest, and covers a total area of 70,560,000 square kilometers. Its area represents 19.5% of the Earth’s total surface. The Indian Ocean has an average depth of 3,741 meters and makes up 19.8% of the Earth’s total water. Moreover, Africa, Australia, Asia and the Southern Ocean surround the ocean to the west, east, north, and south, respectively. The coastline of the Indian Ocean has a total length of 66,526 kilometers.

Southern Ocean

The Southern Ocean, also referred to as the Antarctica Ocean, is the fourth largest, with an area of 21,960,000 square kilometers. Its area makes up 6.1% of the Earth’s total surface. The Southern Ocean consists of the southernmost waters and has a volume of 71,800,000 cubic kilometers. It has an average depth of 3,270 meters and its coastline has total length of 17,968 kilometers. The Southern Ocean is unique since it forms a region in which cold waters from Antarctica and warmer waters of the sub-Antarctic mix.

Arctic Ocean

The Arctic Ocean is the fifth largest, and covers an area of 15,558,000 square kilometres. The ocean has an average depth of 1,205 meters and a total volume of 18,750,000 cubic kilometers, which is 1.4% of the Earth’s waters. Despite being the world’s shallowest and the smallest ocean, it is the second biggest drainage, after the Atlantic Ocean basin. The ocean’s coastline has a length of approximately 45,389 kilometers.

Oceans of the World by Size

RankOceanArea (km2) (%)Volume (km3) (%)Average Depth (m)Coastline (km)
1Pacific Ocean168,723,000
46.6%
669,880,000
50.1%
3,970135,663
2Atlantic Ocean85,133,000
23.5%
310,410,900
23.3%
3,646111,866
3Indian Ocean70,560,000
19.5%
264,000,000
19.8%
3,74166,526
4Southern Ocean21,960,000
6.1%
71,800,000
5.4%
3,27017,968
5Arctic Ocean15,558,000
4.3%
18,750,000
1.4%
1,20545,389

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