Riga, the capital of Latvia, is situated on the Baltic Sea coast on the mouth of the river Daugava. After more than 700 years of German, Swedish, Russian rule, Latvia, with Riga as its capital city, thus declared its independence on November 18, 1918. Soviet occupation and annexation occurred in 1940, but then Latvia declared its full de facto independence in 1991. The Historic Centre of Riga has been declared a UNESCO World Heritage Site, and the city is particularly notable for its extensive Art Nouveau architecture