Harras of Dhamar  The Harras of Dhamar is a volcanic field in Yemen. The volcanic field extends to the east of Dhamar town. The field contains many stratovolcanoes, lava flows, and youthful cones. Basaltic lava flows overlie older Rhyolitic flows. The volcano is responsible for the only 20th century eruption on the Arabian peninsula, apparently in 1937. The field is southeast from Yemen's capital city, Sana'a.