"It is a good region."

Translation: È una regione buona.

[franksuhadolnik]

i answered "è una brava regione"

why is this incorrect?

[Viaggiatore]

"Bravo" usually applies to people.

[ziggKogg]

Adjectives go after the noun.

[dwsmith27]

Position of adjectives:
http://www.italyheritage.com/learn-italian/course/grammar/adjectives.htm

[giuliap]

I think your translation works too. In fact, some adjectives (such as buono, bello etc) go before the noun. Example "Giovanni è un bravo ragazzo", and not "ragazzo bravo".

[ziggKogg]

Maybe the program isn't picking up "bravo" as an acceptable word?

[tooraloorali]

Why is "è un buon paese" not acceptable?

[Ariaflame]

paese is country, land, or sometimes village. But not quite region. There is a specific word for region, which apparently is slightly irregular in spelling, sigh but regione is more appropriate for region, so use that.