Germany officially the Federal Republic of Germany is a country in Central and Western Europe, lying between the Baltic and North seas to the north, and the Alps to the south. It borders Denmark to the north, Poland and the Czech Republic to the east, Austria and Switzerland to the south, and France, Luxembourg, Belgium and the Netherlands to the west. Germany includes 16 constituent states, covers an area of 357,386 square kilometres (137,988 sq mi),  and has a largely temperate seasonal climate. With nearly 83 million inhabitants, it is the second most populous state of Europe after Russia, the most populous state lying entirely in Europe, as well as the most populous member state of the European Union. Germany is a very decentralized country.
Its capital and largest metropolis is Berlin, while Frankfurt serves as its financial capital and has the country’s busiest airport. Germany’s largest urban area is the Ruhr, with its main centres of Dortmund and Essen. The country’s other major cities are Hamburg, Munich, Cologne, Stuttgart, Düsseldorf, Leipzig, Dresden, Bremen, Hannover, and Nuremberg. Various Germanic tribes have inhabited the northern parts of modern Germany since classical antiquity. A region named Germania was documented before 100 AD. During the Migration Period, the Germanic tribes expanded southward. Beginning in the 10th century, German territories formed a central part of the Holy Roman Empire. During the 16th century, northern German regions became the centre of the Protestant Reformation. After the collapse of the Holy Roman Empire, the German Confederation was formed in 1815. The German revolutions of 1848–49 resulted in the Frankfurt Parliament establishing major democratic rights.
In 1871, Germany became a nation state when most of the German states (most notably excluding Switzerland and Austria) unified into the Prussian-dominated German Empire. After World War I and the revolution of 1918–19, the Empire was replaced by the parliamentary Weimar Republic. The Nazi seizure of power in 1933 led to the establishment of a dictatorship, World War Iand the Holocaust. After the end of World War II in Europe and a period of Allied occupation, two German states were
founded: West Germany, formed from the American, British, and French occupation zones, and East Germany, formed from the Soviet occupation zone. Following the Revolutions of 1989 that ended communist rule in Central and Eastern Europe, the country was reunified on 3 October 1990.
Germany is in Western and Central Europe, with Denmark bordering to the north, Poland and the Czech Republic to the east, Austria to the southeast, Switzerland to the south-southwest, France, Luxembourg and Belgium lie to the west, and the Netherlands to the northwest. It lies mostly between latitudes 47° and 55° N and longitudes 5° and 16° E. Germany is also bordered by the North Sea and, at the north-northeast, by the Baltic Sea. With Switzerland and Austria, Germany also shares a
border on the fresh-water Lake Constance, the third largest lake in Central Europe. German territory covers 357,021 km2 (137,847 sq mi), consisting of 349,223 km2 (134,836 sq mi) of land and 7,798 km2 (3,011 sq mi) of water. It is the seventh largest country by area in Europe and the 64th largest in the world.
Elevation ranges from the mountains of the Alps (highest point: the Zugspitze at 2,962 metres or 9,718 feet) in the south to the shores of the North Sea (Nordsee) in the northwest and the Baltic Sea (Ostsee) in the northeast. The forested uplands of central Germany and the lowlands of northern Germany (lowest point: Wilstermarsch at 3.54 metres or 11.6 feet below sea level) are traversed by such major rivers as the Rhine, Danube and Elbe. Germany’s alpine glaciers are experiencing deglaciation. Significant natural resources include iron ore, coal, potash, timber, lignite, uranium, copper, natural gas, salt, nickel, arable land and water.
Most of Germany has a temperate seasonal climate dominated by humid westerly winds. The country is situated in between the oceanic Western European and the continental Eastern European climate. The climate is moderated by the North Atlantic Drift, the northern extension of the Gulf Stream. This warmer water affects the areas bordering the North Sea; consequently in the northwest and the north the climate is oceanic. Germany gets an average of 789 mm (31 in) of precipitation per year; there is no consistent dry season. Winters are cool and summers tend to be warm: temperatures can exceed 30 °C (86 °F).
The east has a more continental climate: winters can be very cold and summers very warm, and longer dry periods can occur. Central and southern Germany are transition regions which vary from moderately oceanic to continental. In addition to the maritime and continental climates that predominate over most of the country, the Alpine regions in the extreme south and, to a lesser degree, some areas of the Central German Uplands have a mountain climate, with lower temperatures and more precipitation.
Though the German climate is rarely extreme, there are occasional spikes of cold or heat. Winter temperatures can sometimes drop to two-digit negative temperatures for a few days in a row. Conversely, summer can see periods of very high temperatures for a week or two. The recorded extremes are a maximum of 40.3 °C (104.5 °F) , and a minimum of −37.8 °C (−36.0 °F)