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The Temperate Northern Pacific is a biogeographic region of the Earth's seas, comprising the temperate waters of the northern Pacific Ocean.

The Temperate Northern Pacific connects, via the Bering Sea, to the Arctic marine realm, which includes the polar waters of the Arctic Ocean. To the south, it transitions to the tropical marine realms of the Pacific, including the Tropical Eastern Pacific along the Pacific coast of the Americas, the Eastern Indo-Pacific in the central Pacific Ocean, and the Central Indo-Pacific of the western Pacific basin. The Taiwan Strait forms the boundary between the Temperate Northern Pacific and the Central Indo-Pacific.

Characteristic fauna include the Pacific salmon and trout (Oncorhynchus spp.), gray whale (Eschrichtius robustus), and North Pacific right whale (Eubalaena japonica).

Coastal waters are home to kelp forests. Kelp forests extend along the west coast of North America from Alaska to Baja California. Kelp are large brown algae which anchor to the sea floor. The dominant species are giant kelp (Macrocystis sp.), which can grow up to 60 metres (200 ft) tall, forming the canopy of the kelp forest and bouyed by air bladders or pneumatocysts at the base of their leaf-like blades. Bull kelp (Nereocystis sp.) is another common canopy species. Species of Saccharina, Laminaria, and Eualaria fistulosa are the predominant kelp species along the coasts of the Russian Far East and Japan. Sea otters (Enhydra lutris) are native to kelp forests of the Temperate Northern Pacific, ranging from the Kuril Islands to Southern California.

Subdivisions

The Temperate Northern Pacific is further subdivided into marine provinces, and the marine provinces divided into marine ecoregions:

Cold Temperate Northwest Pacific

• Sea of Okhotsk
• Kamchatka Shelf and Coast
• Oyashio Current
• Northern Honshu
• Sea of Japan
• Yellow Sea

Warm Temperate Northwest Pacific

• Central Kuroshio Current
• East China Sea

Cold Temperate Northeast Pacific

• Aleutian Islands
• Gulf of Alaska
• North American Pacific Fjordland
• Puget Trough/Georgia Basin
• Oregon, Washington, Vancouver Coast and Shelf
• Northern California

Warm Temperate Northeast Pacific

• Southern California Bight
• Cortezian
• Magdalena Transition

References

1. "Kelp Forest". NOAA Office of National Marine Sanctuaries. National Oceanic and Atmospheric Administration. Retrieved 15 January 2025.
2. ^ "Kelp and Kelp Forests". Smithsonian Ocean. Smithsonian – National Museum of Natural History. Retrieved 15 January 2025.
3. Steneck, Robert; Graham, M. H.; Bourque, B. J.; Corbett, D.; Erlandson, J. M.; Estes, J. A.; and Tegner, M. J., Kelp Forest Ecosystems: Biodiversity, Stability, Resilience and Future (2002). Marine Sciences Faculty Scholarship. 65. https://digitalcommons.library.umaine.edu/sms_facpub/65
4. Spalding, Mark D., Helen E. Fox, Gerald R. Allen, Nick Davidson et al. "Marine Ecoregions of the World: A Bioregionalization of Coastal and Shelf Areas". Bioscience Vol. 57 No. 7, July/August 2007, pp. 573–583.

• Marine realms
• Pacific Ocean
• Temperate Northern Pacific