N. K. Roerich. Karelian landscape
Among the numerous options for the location of the most ancient Indo-European ancestral home already in the 19th century. O. Spiegel proposed the territory of Eastern Europe between 45 and 69° N It was he who first pointed out the obligatory presence of a mountainous landscape on the Indo-European ancestral homeland, noting the insignificant height of these mountains, since rye and wheat were sown on them, the names of which are in the Indo-European parent language.»
On the territory of Eastern Europe there are not so few elevations, especially in its northern part – Valdai, mountains of the Kola Peninsula and Karelia, Northern Uvals, mountain formations of the Arkhangelsk region, Komi, etc.
Returning to the idea of O. Spiegel that the Indo-European ancestral homeland was located in Eastern Europe between 45 and 69° N, we again repeat that it was here, in the era of the Holocene climatic optimum, identical to the end of the common Indo-European period, that there were mountain landscapes with insignificant heights, where there were excellent and optimal opportunities for growing rye, barley, oats, wheat – cereals, whose names are recorded in the common Indo-European parent language. N. D. Andreev relates the time of the appearance and beginning of the independent evolution of the Early Indo-European Proto-language to the time of transition from the Upper Paleolithic to the Mesolithic and the period of the Early Mesolithic, 10—8 thousand BC.