The document discusses the Struma Valley region in southwest Bulgaria. The region has a strong Mediterranean influence due to its proximity to the Aegean Sea. It is well-suited for growing red grape varieties like Melnik, Cabernet Sauvignon, and Merlot. The town of Melnik is a leader in producing strong red wines and is known for its sand pyramids formation. The main wine centers of the region are the towns of Melnik, Sandanski and Petrich, which have seen a revival in winemaking traditions in recent years.