Honshuu
Honshu
noun
You have your origin state. For Japan (since this is a Japanese word), that would be the main island, the big one in the middle: Honshu. You'll have to know some minor Japanese geography for this. Go look at a map of Japan and study it over real quick to see where I'm talking about if you don't know already.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
この後、本州に行くつもりです。
After this I plan on going to Honshu.
本州とは、いったいぜんたい日本のどこにあるんですか？
Where the heck in Japan is Honshu?
本州がどこか分からなければ、パソコンでしらべたらどうですか？
If you don't know where Honshu is, why don't you look it up on your computer?