Peninsula.

Reykjavík region

Famous in the area of Reykjavík is the Grágrýti (, Gray Lava). These tertiary basalt lava layers cover much of the ground around and under Reykjavík, but their origin is unknown. It is thought that the small hills within the city, some of which were islands during periods of glaciation, could be small shield volcanoes from warm spells of the glaciations. But it is known that during the Plio-Pleistocene

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