Mladá Boleslav is a city in the Central Bohemian Region of the Czech Republic. It has about 46,000 inhabitants. It lies on the left bank of th…Mladá Boleslav is a city in the Central Bohemian Region of the Czech Republic. It has about 46,000 inhabitants. It lies on the left bank of the Jizera River. Mladá Boleslav is the second most populated city in the region. It is a major centre of the Czech automotive industry thanks to the Škoda Auto company and therefore the centre of Czech industry as a whole.