Espenberg is located on a peninsula between the Chuckchi Sea to the north and west and Goodhope Bay to the east. From east to west lie North and South Killeak Maar, Devil Mountain Maar and Whitefish Maar; additionally there are cinder cones, lava flows and five small shield-like volcanoes such as Devil Mountain. Devil Mountain appears to be capped with an alignment of cinder cones with associated lava flows. Volcanologically, the field is situated in a back-arc region. Volcanic rocks from the field have basaltic compositions.