The most distinguished landforms in East-Viru County, Estonia, apart from the Baltic Klint, are the artificial landforms(1) generated by mining and processing of oil shale. The data in scientific literature about the height of artificial mountains is poor and sometimes controversial. Ambiguous estimations exist regarding the highest mountain. In the present paper the height of the artificial landforms in North-East Estonia is investigated. Kohtla-Jarve semi-coke mountain is found to be the highest artificial landform in the Baltic States. In addition, typology, history, and future of artificial mountains are studied.