If the point of migdal bavel was to reach the heavens, why not build it on a mountain instead of a valley? וַיְהִי כָל הָאָרֶץ שָׂפָה אֶחָת וּדְבָרִים אֲחָדִים:(ב) וַיְהִי בְּנָסְעָם מִקֶּדֶם ...
Noach's boat is called a teva, which as far as I know means "box". (The same word is used in later Hebrew for coffins and closets (as in "hayored lifne hateva").) It's described, at least according ...