Suruga Bay

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Suruga Bay
Suruga, Satta no Kaijō (The sea off Satta, Suruga), woodblock print by Hiroshige

Suruga Bay (駿河湾, Suruga-wan) is a bay on the Pacific coast of Honshū in Shizuoka Prefecture, Japan. It is situated north of an imaginary line joining Omaezaki Point and Irōzaki Point at the tip of the Izu Peninsula and surrounded by Honshū to the southwest and west and the Izu Peninsula to the east.


Suruga Bay is a place of contrasts. Japan's loftiest peak, Mount Fuji at 3,776 metres (12,388 ft), rises from the 2,500 metres (8,200 ft) depth of the Suruga Trough running up the middle of the bay, which makes it Japan's deepest. Numerous rivers—especially the major Fuji, the Ōi, and Abe rivers—empty into its western portion, giving that area of the bay a seabed rich in submarine canyons and other geographical features, whereas at the bay's easternmost end, only the Kano River empties into a pocket called Uchiura-wan at Numazu, Shizuoka, where the Izu Peninsula connects to Honshu, giving the water greater transparency and leaving the seabed largely flat except for a number of small rocky islands, some joined to the mainland by tombolos; this seabed variety coincides with coastline differences as well: The western and central sections of the Suruga Bay coastline, roughly from Shizuoka, Shizuoka to Numazu, are characterized by sandy beaches such as those at Yuigahama and Tagonoura, whereas the eastern and northeastern stretches from Numazu down the southwestern coast of the Izu Peninsula to Irōzaki, are generally rocky.

The bay is open to the Philippine Sea/Pacific Ocean to the south, but is mostly protected from oceanic waves by Izu Peninsula. This, coupled with the seabed and water characteristics mentioned above, results in conditions favorable to fishing, sailing, windsurfing, swimming and research on deep-sea organisms.[1] An undersea plateau at the bay's southwest end, known as Senoumi, is especially well known as a rich fishing ground.

Suruga Bay was formed by tectonic subduction of the Philippine Sea Plate and the Eurasian Plate at the Suruga Trough, making it a source of considerable seismic activity,[2][3] and giving the bay its extreme depth.

Environmental pollution[edit]

Ever since the post-war industrial boom of Japan the bay has suffered from severe industrial pollution. By 1970 local paper mills produced so much that the small city of Fuji (1970 pop. 180,000) produced 2.4 million tonnes of waste water every day – equivalent to the daily sewage of Tokyo at the time (1970 pop. 9 million). The sulphur-laden sludge was so thick that it threatened to block the harbour, requiring dredging that severely damaged the marine life. Protests from local citizens and fishermen in the area put pressure on the government to take action[4]. Despite subsequent regulations, surveys of local sea life in the mid-2010s continue to show intense PCB and PBDE contamination.[5]

The pollution of Suruga Bay became so infamous that it featured in the 1971 film Godzilla vs. Hedorah. The name of the titular monster is derived from hedoro, the Japanese word for 'mud', and the creature fed off heavy pollution in the bay.


Suruga Bay can be reached by car from Tokyo via Numazu in two to five hours depending on traffic conditions on the Tōmei Expressway or in Numazu.


  1. ^
  2. ^ Sugimoto, S.; Ikuta, R.; Ando, M.; Tadokoro, K.; Okuda, T.; Besana, G. M.; Nagao, T.; Sayanagi, K. (2005). "Evaluation of GPS/Acoustic Seafloor Positioning at Suruga Bay, Central Japan". AGU Fall Meeting Abstracts. 2005: G41A–0349. Bibcode:2005AGUFM.G41A0349S.
  3. ^ Sugimoto, S.; Ikuta, R.; Ando, M.; Tadokoro, K.; Okuda, T.; Yada, K.; Takatani, K.; Besana, G. M. (2004). "Effects of Temporal Variations in Sound Speed Structure at Suruga Bay, Central Japan, on the Observations of Seafloor Crustal Deformation". AGU Fall Meeting Abstracts. 2004: G21A–0146. Bibcode:2004AGUFM.G21A0146S.
  4. ^ Oka, Takashi (1970-08-17). "Japan Urged to Save Polluted Harbor". The New York Times. ISSN 0362-4331. Retrieved 2017-10-30.
  5. ^ >> "<<Banned chemicals persist in deep ocean>>". February 13, 2017.


  • In addition to the sources cited in the text, this article draws on the content of the corresponding article in the Japanese Wikipedia, as well as Japanese articles corresponding to other English Wikipedia articles linked to in the text.

External links[edit]

Media related to Suruga Bay at Wikimedia Commons

Coordinates: 34°51′N 138°33′E / 34.850°N 138.550°E / 34.850; 138.550