History / Silesia occupation [49]

I'm wondering if anyone can tell me more about Silesia because both of my great grandparents came from that region. As far as I know Silesia was divided into Eastern and Western regions. On the Ellis Island documents concerning my great grandparents Silesia is spelled Galicia. I am still trying to accertain the distinct location of where my great grandfather comes from. If I'm right then he came from the "western" Silesia in which his family was from the town of Kobyle which I believe is Southern Poland. Genealogy research has become a must for me as I want to know more about my heritage.