Simplify the following text for a Grade 9 native English-speaking person.
Original: It is the largest such region in terms of area , covering 9200 s including Bristol , Gloucestershire , Somerset , Dorset , Wiltshire , Devon , Cornwall and the Isles of Scilly .
Simplified: It has the largest area of all regions , and reaches from Gloucestershire and Wiltshire to Cornwall and the Isles of Scilly .