The Netherlands, informally Holland, is a country located in Northwestern Europe with overseas territories in the Caribbean. It is the largest of four constituent countries of the Kingdom of the Netherlands. The Netherlands consists of twelve provinces; it borders Germany to the east, Belgium to the south, with a North Sea coastline to the north and west. It shares maritime borders with the United Kingdom, Germany and Belgium in the North Sea. The country's official language is Dutch, with West Frisian as a secondary official language in the province of Friesland. Dutch Low Saxon and Limburgish are recognised regional languages, while Dutch Sign Language, Sinte Romani and Yiddish are recognised non-territorial languages. Dutch, English and Papiamento are official in the Caribbean territories.

The four largest cities in the Netherlands are Amsterdam, Rotterdam, The Hague and Utrecht. Amsterdam is the country's most populous city and the nominal capital. The Hague holds the seat of the States General, Cabinet and Supreme Court. The Port of Rotterdam is the busiest seaport in Europe. Schiphol is the busiest airport in the Netherlands, and the third busiest in Europe.

Netherlands literally means "lower countries" in reference to its low elevation and flat topography, with only about 50% of its land exceeding 1 m (3.3 ft) above sea level, and nearly 26% falling below sea level. Most of the areas below sea level, known as polders, are the result of land reclamation that began in the 14th century.

With a population of 17.7 million people, all living within a total area of roughly 41,800 km2 (16,100 sq mi)—of which the land area is 33,500 km2 (12,900 sq mi)—the Netherlands is the 16th most densely populated country in the world and the second-most densely populated country in the European Union, with a density of 529 people per square kilometre (1,370 people/sq mi).

The Netherlands has been a parliamentary constitutional monarchy with a unitary structure since 1848.

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