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Sea of Japan, Map, Location, Geography & Significance

Sea of Japan

The Sea of Japan, also known by various names, is a marginal sea that lies between the Korean Peninsula, Sakhalin, the Japanese archipelago, and the Russian Far Eastern mainland. The Pacific Ocean and the sea are divided by the Japanese archipelago. Due to its almost full isolation from the Pacific Ocean, it has essentially no tides, similar to the Mediterranean Sea.

The faunal variety and salinity, both of which are lower than in the open ocean, are also impacted by this isolation. Large islands, bays, or capes do not exist in the sea. The input and outflow through the straits that connect it to the Pacific Ocean and adjoining seas dictate the majority of its water balance.

Few rivers empty into the sea, and they only make up 1% of the overall water exchange. The high dissolved oxygen content of the ocean leads to high biological production. As a result, the region’s main economic activity is fishing. Due to political concerns, the volume of shipments over the sea has been relatively low, but it is steadily rising as a result of the expansion of East Asian economies.

Read More: South China Sea

Sea of Japan Map

Here is the Map of the Sea of Japan to understand the geographical location of the Sea of Japan region:

Sea of Japan
Sea of Japan Map

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Sea of Japan Formation

The Sea of Japan was formed during the Cenozoic era about 20-30 million years ago as a result of tectonic plate movements. The sea is bordered by Japan to the east, the Korean Peninsula to the west, and the Russian Far East to the north. Oki was at the bottom of a huge lake that developed between Japan and Eurasia. As the lake continued to separate, seawater began to infiltrate it. The Sea of Japan was created in this manner. Oki was at the sea’s bottom at this very moment.

Read More: East China Sea

Sea of Japan Geography

When the East Asian land bridge was in place, the Sea of Japan was a landlocked region. The Early Miocene is when the Japan Arc first developed. The northern and southern portions of the Japanese archipelago split apart as the Japan Sea began to open in the Early Miocene. The Sea of Japan grew throughout the Miocene.

The sea’s eastern border may be home to a developing subduction zone that caused the significant earthquakes of 1940, 1964, 1983, and 1993.  The Sea of Japan is currently bordered by the Korean Peninsula to the west, the Japanese islands of Hokkaido, Honshu, and Kyushu to the east, and the Russian mainland and the island of Sakhalin to the north. It is connected to other seas by five straits: the Korea Strait between the Korean Peninsula and Kysh; the Tsugaru Strait between Hokkaido and Honshu; the La Pérouse Strait between Sakhalin and the Asian mainland; and the Strait of Tartary between the Asian mainland and Sakhalin.

Read More: Atlantic Ocean

Sea of Japan Significance

The Sea of Japan is a marginal sea of the Western Pacific Ocean, located between Japan, Russia and the Korean Peninsula. It covers an area of about 378,000 square kilometres and has a maximum depth of about 3,742 meters. Major ports on the sea include Vladivostok in Russia, Busan in South Korea, and Niigata and Moji in Japan.

The sea is known for its abundant fishing resources and is an important shipping route connecting Asia and the Pacific. The sea has played a significant role in the cultural and historical development of the surrounding countries and is home to a diverse range of marine life and has been designated as an important area for conservation. The Sea of Japan is an important area for oceanographic and geological research, providing valuable data for understanding ocean currents, climate patterns, and plate tectonics.

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What is the Sea of Japan called?

The Sea of Japan, also known as East Sea, Korean Tonghae or Donghae, the Japanese Nihon-kai, the Russian Yaponskoye More, and other names, is a peripheral sea of the western Pacific Ocean. In the east, it is bordered by Japan and Sakhalin Island, and in the west, by Russia and Korea on the Asian continent. It has a 377,600 square mile area (978,000 square km).

Why is it called the Sea of Japan?

However, the term "Sea of Japan" was first used in Europe in the late 18th and early 19th centuries and is based on the topographical characteristics of this sea area.

What is special about the Sea of Japan?

The Sea of Japan is a small sea in the Pacific Ocean that has the appearance of a carrot from above. Its surface size is 1,050,000 square kilometres, and its maximum depth is 4568 metres, with an average depth of 1752 metres. Its deepest point is the Dohoku seamount, an underwater volcano.

What is the Sea of Japan controversy?

Between the islands of Japan, Russia, North Korea, and South Korea, there lies a body of water. A common name for this body of water has not been decided upon by the involved nations. Most nations have so far used the name Sea of Japan.

Does the Sea of Japan have tides?

First, low tide and high tide have different times. Second, the sea level in the Sea of Japan only varies by about 30 cm, compared to the Pacific Ocean's two-meter swings in sea level. This is a result of the Sea of Japan's unique properties.

Is the Sea of Japan salty?

The average water salinity in the Sea of Japan is likewise slightly lower (34.09, which indicates parts per thousand) than in the Pacific Ocean due to its hydrological isolation. In the south, where evaporation outpaces precipitation, the maximum salinity during the winter is recorded at 34.5.


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