Halychyna (known in some languages as Galicia) is a historical region in the west of Ukraine, lying north of the Carpathian mountains and bounded by the Zbruch River to the east. It borders Poland. Halychyna constituted a distinct medieval state, at some periods of history was a part of other European countries and empires, and was actively involved in establishing the Ukrainian state. It is one of the important centres of Ukrainian culture. The region's largest cities are Lviv (the entire historical city centre is a UNESCO World Heritage Site), Ivano-Frankivsk, and Ternopil. The region maintains a rich castle heritage. Halychyna has a vibrant scene of entrepreneurship and social projects.