The Forgotten Giants: Iceland’s Unrivaled 19th-Century Mass Strandings

Over 200 years ago, Iceland was the site of two of the most significant cetacean mass strandings in documented history. These two strandings would result in the deaths of 3000 long finned black dolphins (pilot whales). Uniquely, both events occurred within just four years of one another in the exact same region. One of these stands as the largest single mass stranding in recorded history worldwide—while the other rivalled the famous 1918 stranding of 1,000 pilot whales in New Zealand’s Chatham Islands. (See note below concerning the New Zealand stranding).

1809: Akranes, Faxaflói Bay

In 1809, an estimated 1,000 long-finned pilot whales (Globicephala melas) stranded along the shallow, low-sloping mudflats near Akranes in southwestern Iceland. In Icelandic cetacean literature, this is widely cited as the earliest formally documented major pilot whale mass stranding in the nation’s historical records. The gently sloping bathymetry of Faxaflói Bay is thought to have disrupted the whales’ echolocation, a factor that continues to cause strandings in the region today.

1813: Snæfellsnes Peninsula, Faxaflói Bay

Just four years later, a second mass stranding occurred along the Snæfellsnes peninsula, involving approximately 2,000 long-finned pilot whales. To this day, the 1813 Snæfellsnes incident remains the single largest mass stranding of cetaceans ever recorded anywhere in the world.

A Lifeline for Local Communities

In 19th-century Iceland, these tragic events were viewed through a very different lens. Regional annals recorded the 1809 and 1813 incidents primarily as major resource windfalls—referred to in Icelandic as hvalreki (literally "whale drift," the origin of the modern Icelandic idiom for a windfall or stroke of good fortune). Coastal communities mobilized rapidly to harvest the meat and blubber, documenting the sheer magnitude of the herds (~1,000 and ~2,000 individuals) as a vital safeguard against hardship and winter famine.

Note on the New Zealand stranding: The "1,000 black dolphins in 1918" story originated from retrospective compilation of mid-20th-century marine mammal databases, rather than a verified contemporary 1918 newspaper report. The Primary Catalyst: Dr. Warren Brabyn (1991). The primary entry point for this event into modern global science was a major academic publication in 1991: Dr. Warren Brabyn’s An Atlas of Cetacean Strandings in New Zealand (published by the Department of Conservation). Brabyn attempted to catalog every known New Zealand stranding from 1840 to 1987. For early 20th-century events in isolated locations like the Chatham Islands, he relied on: Hand-written museum records (like those held at the Dominion Museum/Te Papa). Unpublished personal diaries and letters from early settlers and naturalists. Unverified local council/regional archives and oral tradition passed down by Chatham Islanders. Brabyn recorded the 1918 event based on these secondary notes. Because his atlas became the official foundation for the New Zealand Department of Conservation (DOC) Stranding Database, the 1918 entry was codified into law and official science. The Global "Citation Loop" Once an entry enters an official government database, it becomes a "truth anchor" for global academia: 1991: DOC publishes Brabyn’s atlas listing ~1,000 whales in 1918. 2000s: Global scientific bodies (e.g., the International Whaling Commission) and references like Te Ara (Encyclopedia of New Zealand) cite the DOC database. Present: Popular websites, media, and Wikipedia cite Te Ara or DOC, creating a closed loop of self-referencing authorities where no one goes back to check for the missing 1918 primary source. Was It a Real Event Misdated, or an Exaggeration? Historical marine biologists who have looked back at the Brabyn records suspect two main possibilities: Conflation with another year: In the late 19th and early 20th centuries, massive pilot whale strandings occurred frequently on Long Beach. An un-dated massive stranding recorded in a settler's journal may have simply been assigned the arbitrary year "1918" when cataloged decades later. A Visual Estimate of a Real Disaster: Mass strandings on Long Beach can span several kilometers. When islanders came across hundreds of decaying carcasses stretched across the bay, an offhand estimate of "must be a thousand of 'em" was likely written in a personal note or ledger, which eventually became the fixed historical figure "1,000". It was created by early 20th-century oral history and informal records being formalized into a government database in 1991, where it was transformed from a rough local estimate into an official historical record.