Tjörnes () is a

peninsula A peninsula (; ) is a landform that extends from a mainland and is surrounded by water on most, but not all of its borders. A peninsula is also sometimes defined as a piece of land bordered by water on three of its sides. Peninsulas exist on all ...

situated at the northeast of

Iceland Iceland ( is, Ísland; ) is a Nordic island country in the North Atlantic Ocean and in the Arctic Ocean. Iceland is the most sparsely populated country in Europe. Iceland's capital and largest city is Reykjavík, which (along with its s ...

, between the

fjords In physical geography, a fjord or fiord () is a long, narrow inlet with steep sides or cliffs, created by a glacier. Fjords exist on the coasts of Alaska, Antarctica, British Columbia, Chile, Denmark, Germany, Greenland, the Faroe Islands, Icela ...

Öxarfjörður Öxarfjörður () is a broad fjord in northeastern Iceland, situated between the Tjörnes and Melrakkaslétta headlands. Geography Öxarfjörður is encircled by mountain ranges to the west and east, and the Gjástykki lava fields and an ar ...

and

Skjálfandi Skjálfandi (; also known as Skjálfandaflói ) is a bay in northern Iceland, with some of the characteristics of a fjord. The Icelandic word ''Skjálfandi'' literally translates to ''trembling'' which may refer to earthquakes in the area. The bay ...

. Tjörnes is known for its particularly dense population of

Rock Ptarmigan The rock ptarmigan (''Lagopus muta'') is a medium-sized game bird in the grouse family. It is known simply as the ptarmigan in the UK. It is the official bird for the Canadian territory of Nunavut, where it is known as the ''aqiggiq'' (ᐊᕿ� ...

and the rich

fossil A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...

record of

Miocene The Miocene ( ) is the first geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and means "less recen ...

Pliocene The Pliocene ( ; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58Iceland Iceland ( is, Ísland; ) is a Nordic island country in the North Atlantic Ocean and in the Arctic Ocean. Iceland is the most sparsely populated country in Europe. Iceland's capital and largest city is Reykjavík, which (along with its s ...

named the ''Tjornes Fracture Zone''. It is a series of underwater fissure vents that last erupted in 1868.

References

Peninsulas of Iceland {{Iceland-geo-stub