The author of this work, a professional search geologist in the past, and now a toponymist, realized that it was impossible to find Great Hungary, and if it existed, then it can only be calculated. Therefore, the author undertook to solve this problem, provided that there are no written sources, in the only possible way - an analysis of the geographical names of Eurasia and an analysis of the vocabulary of the Hungarians and all their possible neighbors. The author is sure that he solved the problem. The author is also sure that he managed to calculate the territories of Ethelkoz and Levedia.