Slavic invasion probably shaped the present geographic spread of the Albanians. It is likely that Albanians took refuge in the mountainous areas of northern and central Albania, eastern Montenegro, western North Macedonia and Kosovo. Long-standing contact between Slavs and Albanians might have been common in mountain passages and agriculture or fishing areas, in particular in the valleys of the White and Black branches of the Drin and around the Shkodër and Ohrid lakes. The contact with one another in these areas have caused many changes in Slavic and Albanian local dialects.