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Title
An aerial drone view of the Kiviõli semi-coke hills or Kiviõli ash hills are mountains formed by piling up oil shale semi-coke #189244065
Description
Kiviõli semi-coke hills or Kiviõli ash hills are mountains formed by piling up oil shale semi-coke in the northwestern part of Kiviõli. Mountains are often mistakenly called ash mountains.The hills have formed during the storage of semi-coke produced by the Kiviõli and Kohtla-Järve chemical plants in the production of shale oil.