An area in South Moravia, around Hodonín and Břeclav, is part of the Viennese Basin. Petroleum and lignite are found there in abundance. The main economic centres of Moravia are Brno, Olomouc and Zlín, plus Ostrava lying directly on the Moravian-Silesian border. As well as agriculture in general, Moravia is noted for its viticulture; it contains 94% of the Czech Republic's vineyards and is at the centre of the country's wine industry. Wallachia have at least a 400-year-old tradition of slivovitz making.