The Holy Roman Empire is more an organization than a country. It is formally led by a Kaiser. The southern borders are: The Mediterranen sea down as far as Tuscany, then its eastern borders, until the eastern borders of OTL Modena province, then the northern banks of the lower Po river and from there the Adriatic sea. The eastern border is fixed on the eastern borders of OTL Slovenia except Prekmurje, then OTL western borders of Burgenland, then the eastern borders of Republic of the Bohemian Union (FoR), from there along the traditional border of OTL East Pomerania.