 Czech Silesia is now part of the Czech Republic, forming the Moravian-Silesian Region and the northern part of the Olomouc Region.Germany retains the Silesia-Lusatia region ("Niederschlesien-Oberlausitz" or "Schlesische Oberlausitz") west of the Neisse, which is part of the federal state of Saxony.Most of Silesia is relatively flat, although its southern border is generally mountainous.