Eirk Bog is a national nature reserve of approximately 40 acres (0.16 km2) in County Kerry.

Eirk Bog was legally protected as a national nature reserve by the Irish government in 1986.

[3] The underlying geology of the site is old red sandstone.

The Bog is the most southerly area in Ireland used by the Greenland white-fronted goose, and one of the few peatlands used by the birds as a feeding site.

[4][5] In 2017, it was proposed that Eirk Bog be included in an extension of the UNESCO Killarney National Park Biosphere into a larger Kerry Biosphere.