Another dispute is about the geographic reference point of the mentioned "sea to which they come down to after 30 days, is that which is called dark." Some scholars believe this is a reference to the Baltic Sea, to which people could travel in less than 15 days from Lesser Poland. Others say it is the Black Sea, to which travel would take around 30 days from Prykarpattia (river San and city of Przemyśl). The Byzantines knew of the present-day Black Sea very well, but they did not refer to it as "Black" or "Dark", but by a word meaning "Hospitable" (Εὔξεινος), an euphemism for "Inhospitable". They also used a different term for the word "sea" in its case ("Πόντος" ("Póntos") and not "θάλασσα" ("Thálassa")). However, more probable is a reference to the Black Sea because in "DAI" there's no reference to the Baltic Sea, the chapter has information usually found in 10th century Arabian sources like of Al-Masudi, the Black Sea was of more interest to the Eastern merchants and Byzantine Empire, and its Persian name "Dark Sea" ("axšaēna-") was already well known.