Luxembourg is a parliamentary, democracy headed by a constitutional monarch. Under the constitution of 1868, executive power is exercised by the Grand Duke and the cabinet, which consists of several other ministers.
Luxembourg has a number of minor rivers, such as the Eisch, the Alzette, and the Pétrusse, but the main river is the Moselle with its tributaries-the Sûre and the Our. Together, their courses serve as a natural boundary between Luxembourg and Germany. Along their banks, many of the country's medieval castles can be found.
In Luxembourg, Easter is the most important religious holiday, just as it is in plenty other Christian countries. This holiday begins with the Lent and ends in the first Tuesday after Easter proper.