Lentuankoski consists of the Iso Lentuankoski (Large Lentuankoski) and Pieni Lentuankoski (Small Lentuankoski) Rapids, separated by a short body of stagnant water. The Iso Lentuankoski Rapids flow wildly for about 300 metres and drops about 3,3 metres. The Pieni Lentuankoski Rapids flow more calmly towards Lake Lammasjärvi, but are slightly longer, about 400 metres with a drop of about 1,8 metres. The total length of the rapids with the body of still water is 1,200 metres and the total drop 5.3 metres.

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