R' Yehosef Schwartz, in his Tevuos HaAretz (composed in the 1840s), writes (translation from here):
Twenty-five miles southeast of
Baal-bek is the village Sachala, where
the inhabitants point out a monument,
which they allege to mark the grave of
Noah. That, however, but little faith
can be placed in such like popular
legends, will appear from the fact
that also in the land of Armenia, in
the vicinity of Mount Dshudi (the
Ararat of Gen. 8:4), on which the ark
rested at the flood, they also point
out an alleged grave of Noah. But
other similar examples can be cited to
prove the credulity of the people in
giving currency to unauthenticated
legends.
So we probably don't really know for certain.
