Mt Esja is a Plio-Pleistocene volcano dominating the horizon to the north of Reykjavik.

It is 914 m in height and erupted between 3.1 and 1.8 million years ago.

The mountain consists of basaltic lavas as well as gabbroic intrusions and numerous basaltic dykes,

clastic (volcanic and glacial sediments) and rhyolite.

The following stamp was issued October 9th, 2001

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