Onderwierum is a hamlet in the municipality of Het Hogeland, in the province of Groningen.

The hamlet is built on two mounds and includes a former cemetery.

The hamlet had its own church dating from the Middle Ages which was demolished in 1841.

The name has been reconstructed as Unlanderena wêr-hêm and is thus explained as a raised height (wierde) of people who lived in onland ("swamp").

[3] Media related to Onderwierum at Wikimedia Commons