Why don't you try a comparison between the Mississippi for Huck Finn and
Piave river for Nick Adams ? In relation to both the characters, the
is a symbolic frontier between adolescence and maturity and, if you
the historical periods in wich the two have been created, also a frontier
the american experience (the american dream loosing its innocence before
the western frontier, then in Europe). You can find informations about it
Ed. Mursia, Milano, 1962.
A copy of this book is at the Braidense National Library in Milan.
Starting from this point, you can also try a comparison between Huck and
(the river, a geographic frontier for America) and Holden Caufield (the
a cultural frontier and a new loss of innocence with Korean war,
and, ten years later, the Vietnam).
Hoping that this can give you some idea,