herðubreið (, "broad-shouldered") is a tuya in north-east iceland. it is situated in the highlands of iceland at the east side of the ódáðahraun desert and close to askja volcano. the desert is a large lava field originating from eruptions of "trölladyngja" and other shield volcanoes in the area. herðubreið was formed beneath the icesheet that covered iceland during the last glacial period.