Greg Arnold wrote:
If I am a Region 12 (So Cal) pilot flying in Region 11 (Nevada, among
other places), I must enter the flight in Region 11? Could you cite the
rule that says that?



I'll bite (since no explicit rule exists as you suggest....)

-Quoting the rules (see last sentence):

6. Flight claiming
Fliht claims will be only accepted at www.onlinecontest.org. Claimes
have to be submitted by 24:00 (midnight) on the Tuesday following the
flight local time of the finish point.
The IGC-file has to be submitted as part of the flight claim.
By submitting the flight the participant certifies that the flight took
place as claimed.

-end quote

If you submit, you are stating the flight "took place as claimed", and
since specifiying the region is part of the claim you must specify the
correct region, else you are not following the rules.

Let the guy who makes the best flight in the region win that region....
or is this stating the obvious?

.... not a lawyer......