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The Avalanche Sea Serpents of Hạ Long Bay
July 1897 · Hạ Long Bay and the Baie de Fai-Tsi-Long (Bái Tử Long Bay), Tonkin
Vietnam
Cryptid · Creature · 17 sources
26Thinly documented
S. W. Hanna's "Young Sea-Serpent" in the Nets at New Harbor, Maine
August 1880 · Off New Harbor, Pemaquid peninsula, Bristol, Lincoln County, Maine
United States
Cryptid · Creature · 11 sources
21Thinly documented
The Kiushiu Maru sea serpent gripping a whale off Cape Satano
April 5, 1879 · At sea about nine miles off Cape Satano (Cape Sata), Ōsumi Peninsula, Kagoshima, Kyushu
Japan
Cryptid · Creature · 15 sources
18Thinly documented
Major H. W. J. Senior's sea serpent from the SS City of Baltimore, Gulf of Aden, 1879
January 28, 1879 · Western Gulf of Aden, east-southeast of the Bab-el-Mandeb strait (lat. 12° 28′ N, long. 43° 52′ E)
International waters
Cryptid · Creature · 11 sources
19Thinly documented
The Royal Yacht Osborne Sea Monster off Sicily
June 2, 1877 · Off the north coast of Sicily, toward Cape Vito (Capo San Vito)
Italy
Cryptid · Creature · 18 sources
21Thinly documented
The SS Nestor sea serpent
September 11, 1876 · Strait of Malacca, fifteen miles north-west of North Sand Lighthouse, off Selangor
Malaysia
Cryptid · Creature · 14 sources
19Thinly documented
The Barque Pauline Sea Serpent Off Cape Roque
July 8, 1875 · Off Cape Roque (Cabo de São Roque), north-east Brazil, South Atlantic
Brazil
Cryptid · Creature · 22 sources
22Thinly documented
The Leda sea serpent: Rev. John Macrae and Rev. David Twopeny at Loch Hourn and the Sound of Sleat, 1872
August 20, 1872 · Loch Hourn and the Sound of Sleat, near Glenelg, Inverness-shire, Scotland
United Kingdom
Cryptid · Creature · 14 sources
27Thinly documented
The Castilian Sea Serpent off St Helena
December 12, 1857 · About ten miles off the northeast end of St Helena, South Atlantic
Saint Helena
Cryptid · Creature · 15 sources
24Thinly documented
The Monongahela Sea Serpent
January 13, 1852 · East-central Pacific Ocean, just south of the equator (reported position 3°10′S, 131°50′W)
International waters
Cryptid · Creature · 10 sources
14Thinly documented
The HMS Plumper Sea Serpent
December 31, 1848 · Open Atlantic, nearly due west of Oporto (41°13′N, 12°31′W)
International waters
Cryptid · Creature · 14 sources
11Thinly documented
The Brig Daphne Sea Serpent Hoax
September 20, 1848 · Gulf of Guinea, off Gabon and the Republic of Congo (lat. 4° 11′ S., long. 10° 15′ E.)
International waters
Cryptid · Creature · 14 sources
2Thinly documented
The British Officers' Sea Serpent of St. Margaret's Bay
May 15, 1833 · St. Margaret's Bay, between Halifax and Mahone Bay, Nova Scotia
Canada
Cryptid · Creature · 16 sources
27Thinly documented
The Nahant sea serpent: Marshal James Prince and Samuel Cabot at Long Beach, 1819
August 1819 · Long Beach, Nahant, Massachusetts
United States
Cryptid · Creature · 16 sources
27Thinly documented
Captain Lorenz von Ferry's sea serpent off Molde, 1746
August 1746 · Jule-Naess (very probably Julneset), near Molde, Møre og Romsdal
Norway
Cryptid · Creature · 20 sources
24Thinly documented