Detailed Instructions: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
Problem:Valle d 'Aosta is a mountainous region in northwestern Italy .
Solution:
The Aosta Valley ( -RSB- ( official ) or ( usual ) ; -RSB- ( official ) or ( usual ) ; ( usual ) ; or ; ) is a mountainous autonomous region in northwestern Italy .