*** NOT A TEACHER ***
(1) As you know, the beautiful and orderly nation of Switzerland has Lake Geneva.
(2) I notice that in the 19th century and in the earlier part of the twentieth century,
most English writers referred to it as The Lake of Geneva.
(3) Perhaps this is an example of how English (and other languages?) tend to
simplify over the years. You can see this development in countries' names, for we
no longer refer to:
the Sudan, the Lebanon, the Ukraine, etc.