Along with Lake Sevan in today 's Armenia and Lake Urmia in today 's Iran , Van was one of the three great lakes of the Armenian Kingdom , referred to as the seas of Armenia ( in ancient Assyrian sources : `` tâmtu ša mât Nairi '' ( Upper Sea of Nairi ) , the Lower Sea being Lake Urmia ) .
Along with Lake Sevan in today 's Armenia and Lake Urmia in today 's Iran , Van was one of the three great lakes of the Armenian Kingdom , referred to as the seas of Armenia .