Definitely not.  That is fanfic legend and just plain stupid (to show
Ryouga in the USA, or on Dune, or whatever.  Of course, for comedic
effect such a scene could be useful and it has been used in a number
of early fanfics for exactly that purpose, but along the way it's
become accepted as the norm. >>
Um, to me it is a reasonable idea: he has no sense of direction, correct?
So how the H@ll could he manage to keep himself to only two countries?
My guess is that the reason we only see him in China and Japan is because
he's not relevant to the story when he's elsewhere, and for all his

ability to

get lost he can only travel so fast...  (So remember folks, don't put him

in

the US a day after he turned up at the Tendo Dojo.)
And please, private replies.

I know you asked for private replies, but this could actually settle the
blasted argument, so I'm posting it to the list as well.

There's a scene in the anime (from Ryouga's flashback of his attempts to
find the vacant lot where he was to fight Ranma) that shows him having
no clue where he is and the Eiffel Tower in the background....  And, of
course, he did make it there, to lots of places in Japan, and back to
his starting point in four days.  So much for a limited travel rate.
Yes it's ridiculous.  But, it's also apparently cannon.  Other planets?
I doubt it.  But, without that scene, I would have doubted his ability
to cross oceans without knowing it, and agreed with the person saying
it's just a stupid fanfic legend.

Actually, that's not the Eiffel Tower, it's Tokyo Tower, a very similar
looking structure.

Morpheus the Shaper
http://milamber.home.mindspring.com