Qualla: Yellow Sea

Yellow Sea: Introduction

Sat, 14 Mar 2026 00:00:00 GMT

Photo credit NASA Goddard Space Flight Center from Greenbelt, MD, USA, Public domain. Twice a year, for approximately one hour, you can walk across it. Between Jindo and Modo islands off the southern coast of Korea, tidal variations in the Yellow Sea open a land pass nearly three kilometers long and several meters wide, a phenomenon locals have celebrated for centuries but that remained virtually unknown to the outside world until 1975, when the French ambassador described it in a Parisian newspaper. The "Jindo Sea Parting" captures something essential about this body of water: the Yellow Sea is so shallow -- just 44 meters on average, with a maximum depth of only 152 meters -- that the boundary between land and sea is negotiable, seasonal, and sometimes temporary.

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Image: NASA Goddard Space Flight Center from Greenbelt, MD, USA | Public domain

Yellow Sea: Named for Its Burden

Sat, 14 Mar 2026 00:00:00 GMT

Photo credit JesseW900, CC BY-SA 4.0. The Yellow Sea is one of four seas named for a color, alongside the Black, Red, and White Seas. Its name is literal: the Yellow River and other major waterways dump so much silt into these waters that the sea turns golden-yellow, a color visible from orbit. Spanning approximately...

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Image: JesseW900 | CC BY-SA 4.0

Yellow Sea: The Flyway's Bottleneck

Sat, 14 Mar 2026 00:00:00 GMT

Photo credit Johanne Wahanna, CC BY-SA 4.0. The Yellow Sea's tidal mudflats are among the most important migratory bird habitats on Earth. A 10-kilometer belt of intertidal flats stretches along the entire western coast of Korea, covering 2,850 square kilometers of highly productive sediment rich in benthic life. Surveys h...

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Image: Johanne Wahanna | CC BY-SA 4.0

Yellow Sea: Whales That Were

Sat, 14 Mar 2026 00:00:00 GMT

Photo credit Photograph: NASA, Public domain. The catalogue of what the Yellow Sea has lost reads like a natural history of abundance. Fin whales once maintained a resident population here. Gray whales were historically present. North Pacific right whales, humpback whales, Baird's beaked whales, and even blue whales once mig...

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Image: Photograph: NASA | Public domain

Yellow Sea: 250 People Per Square Kilometer

Sat, 14 Mar 2026 00:00:00 GMT

Photo credit Saewon108, CC BY-SA 4.0. The coasts of the Yellow Sea are among the most densely populated on Earth, averaging approximately 250 people per square kilometer. Major Chinese ports include Dalian, Tianjin, Yantai, Qingdao, and Qinhuangdao. South Korea's Incheon, Gunsan, and Mokpo line the eastern shore, whi...

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Image: Saewon108 | CC BY-SA 4.0