I hope this helps
Chamberlain agrees to German demand
The army of the North was far better equipped at the start and during the war because of its stronger industrial base. The North had many more factories than the South. This allowed the North to keep its army well supplied at the start of the Civil War and during its duration.
This is Honshu, with the area of 88,000 sq mi.
After this it's Hokkaido 32,000 sq mi
Then Kyushu (13,760 sq mi)
and the smallest is Shikoku - 7,300 sq mi.