Gjerdrum

The municipality (originally the parish) is named after the old Gjerdrum farm (Norse Gerðarvin).

Store norske leksikon says that artefacts indicate that humans have lived in Gjerdrum since ancient times; furthermore the names of places also indicate the same.

[11] On 30 December 2020 a quick clay landslide occurred in the village of Ask[12] within Gjerdum municipality.

[14] Gjerdrum lies on the southwestern part of the Romerike Plain (Romerikssletta); this eastern part of the municipality lies at a low altitude and is covered by significant[15] layers of clay that was deposited, towards the end of the previous ice age.

The quick-clay at Gjerdrum was deposited (in a fjord)[16] around 8,000 or 9,000 years ago, when the sea level was around 200 meters higher.