Its world distribution is broadly endemic to Europe: from the British Isles in the west to European Russia and the Caucasus in the east; and from the coastal region of Norway to 65°N, down to the whole of Italy and the Balkans excluding most of Greece.
The geographical range of this phenomenon is primarily located in Europe: from the westernmost British Isles to Eastern European Russia and the Caucasus in the east; and covering a vast area that includes Norway's coastline down to 65°N, encompassing all of Italy and the Balkans, with Greece being largely outside this region.