"Mentonomon" is unambiguously stated to be an "aestuarium" or "estuary" of 6000 stadia, which using the Herodotean standard of per stadium is . That number happens to be the distance from the mouth of the Skagerrak to the mouth of the Vistula, but no source says explicitly where the figure was taken. Competing views, however, usually have to reinterpret "estuary" to mean something other than an estuary, as the west of the Baltic Sea is the only body of estuarial water of sufficient length in the region.