Question: When did the country containing the Pihtsusköngäs waterfall join the Russian Empire?

full_context: Document 1: Pihtsusköngäs: Pihtsusköngäs, also known as the "Niagara of Finland" or the "King of Finnish waterfalls" is the largest waterfall in all of Finland. Its maximum height is . It is located in the Käsivarsi Wilderness Area, about from the village Kilpisjärvi within the municipality of Enontekiö. It is accessible by following the Nordkalottleden Trail, an 800 kilometer hiking route than runs through Finland, Sweden and Norway.
Document 2: Nohkalikai Falls: Nohkalikai Falls is the tallest plunge waterfall in India. Its height is 1115 feet (340 metres), making it as the highest waterfall in India. The waterfall is located near Cherrapunji, one of the wettest places on Earth. Nohkalikai Falls are fed by the rainwater collected on the summit of comparatively small plateau and decrease in power during the dry season in December - February. Below the falls there has formed a plunge pool with unusual green colored water.
Document 3: Russian language: According to figures published in 2006 in the journal "Demoskop Weekly" research deputy director of Research Center for Sociological Research of the Ministry of Education and Science (Russia) Arefyev A. L., the Russian language is gradually losing its position in the world in general, and in Russia in particular. In 2012, A. L. Arefyev published a new study "Russian language at the turn of the 20th-21st centuries", in which he confirmed his conclusion about the trend of further weakening of the Russian language in all regions of the world (findings published in 2013 in the journal "Demoskop Weekly"). In the countries of the former Soviet Union the Russian language is gradually being replaced by local languages. Currently the number speakers of Russian language in the world depends on the number of Russians in the world (as the main sources distribution Russian language) and total population Russia (where Russian is an official language).
Document 4: Russian language: Significant Russian-speaking groups also exist in Western Europe. These have been fed by several waves of immigrants since the beginning of the 20th century, each with its own flavor of language. The United Kingdom, Spain, Portugal, France, Italy, Belgium, Greece, Brazil, Norway, and Austria have significant Russian-speaking communities. According to the 2011 Census of Ireland, there were 21,639 people in the nation who use Russian as a home language. However, of this only 13% were Russian nationals. 20% held Irish citizenship, while 27% and 14% were holding the passports of Latvia and Lithuania respectively.
Document 5: Russian language: As the Grand Duchy of Finland was part of the Russian Empire from 1809 to 1918, a number of Russian speakers have remained in Finland. There are 33,400 Russian-speaking Finns, amounting to 0.6% of the population. Five thousand (0.1%) of them are late 19th century and 20th century immigrants or their descendants, and the remaining majority are recent immigrants who moved there in the 1990s and later.[citation needed] Russian is spoken by 1.4% of the population of Finland according to a 2014 estimate from the World Factbook.
Document 6: Niagara Falls: Located on the Niagara River, which drains Lake Erie into Lake Ontario, the combined falls form the highest flow rate of any waterfall in the world that has a vertical drop of more than 165 feet (50 m). Horseshoe Falls is the most powerful waterfall in North America, as measured by flow rate. The falls are 17 miles (27 km) north - northwest of Buffalo, New York, and 75 miles (121 km) south - southeast of Toronto, between the twin cities of Niagara Falls, Ontario, and Niagara Falls, New York.
Document 7: Russian language: The language was first introduced in North America when Russian explorers voyaged into Alaska and claimed it for Russia during the 1700s. Although most colonists left after the United States bought the land in 1867, a handful stayed and preserved the Russian language in this region to this day, although only a few elderly speakers of this unique dialect are left. Sizable Russian-speaking communities also exist in North America, especially in large urban centers of the U.S. and Canada, such as New York City, Philadelphia, Boston, Los Angeles, Nashville, San Francisco, Seattle, Spokane, Toronto, Baltimore, Miami, Chicago, Denver and Cleveland. In a number of locations they issue their own newspapers, and live in ethnic enclaves (especially the generation of immigrants who started arriving in the early 1960s). Only about 25% of them are ethnic Russians, however. Before the dissolution of the Soviet Union, the overwhelming majority of Russophones in Brighton Beach, Brooklyn in New York City were Russian-speaking Jews. Afterward, the influx from the countries of the former Soviet Union changed the statistics somewhat, with ethnic Russians and Ukrainians immigrating along with some more Russian Jews and Central Asians. According to the United States Census, in 2007 Russian was the primary language spoken in the homes of over 850,000 individuals living in the United States.
Document 8: Russian language: In Kazakhstan Russian is not a state language, but according to article 7 of the Constitution of Kazakhstan its usage enjoys equal status to that of the Kazakh language in state and local administration. According to estimates from Demoskop Weekly, in 2004 there were 4,200,000 native speakers of Russian in the country, and 10 million active speakers. 63% of the population was fluent in Russian in 2006, and 46% used it as the main language with family, friends or at work. According to a 2001 estimate from the World Factbook, 95% of the population can speak Russian. Large Russian-speaking communities still exist in northern Kazakhstan, and ethnic Russians comprise 25.6% of Kazakhstan's population. The 2009 census reported that 10,309,500 people, or 84.8% of the population aged 15 and above, could read and write well in Russian, as well as understand the spoken language.
Document 9: Niagara Falls: Niagara Falls is the collective name for three waterfalls that straddle the international border between the Canadian province of Ontario and the American state of New York. They form the southern end of the Niagara Gorge.
Document 10: Nohkalikai Falls: Nohkalikai Falls is the tallest plunge waterfall in India. Its height is 1115 feet (340 metres). The waterfall is located near Cherrapunji, one of the wettest places on Earth. Nohkalikai Falls are fed by the rainwater collected on the summit of a comparatively small plateau and decrease in power during the dry season in December - February. Below the falls there has formed a plunge pool with unusual green colored water.
Document 11: Kjeragfossen: Kjeragfossen is a waterfall in the municipality of Forsand in Rogaland county, Norway. The long waterfall cascades down from the Kjerag plateau on the south shore of the Lysefjorden. It is one of the highest waterfalls in Norway and one of the highest in the world. It is a plunge-style waterfall that is usually only active about 5 months of the year. The waterfall is located in a very scenic area that has many tourists each year. The famous Kjeragbolten boulder is located nearby.
Document 12: Russian language: Ethnic Russians constitute 25.5% of the country's current population and 58.6% of the native Estonian population is also able to speak Russian. In all, 67.8% of Estonia's population can speak Russian. Command of Russian language, however, is rapidly decreasing among younger Estonians (primarily being replaced by the command of English). For example, if 53% of ethnic Estonians between 15 and 19 claim to speak some Russian, then among the 10- to 14-year-old group, command of Russian has fallen to 19% (which is about one-third the percentage of those who claim to have command of English in the same age group).
Document 13: Russian language: In the 20th century, Russian was mandatorily taught in the schools of the members of the old Warsaw Pact and in other countries that used to be satellites of the USSR. In particular, these countries include Poland, Bulgaria, the Czech Republic, Slovakia, Hungary, Albania, former East Germany and Cuba. However, younger generations are usually not fluent in it, because Russian is no longer mandatory in the school system. According to the Eurobarometer 2005 survey, though, fluency in Russian remains fairly high (20–40%) in some countries, in particular those where the people speak a Slavic language and thereby have an edge in learning Russian (namely, Poland, Czech Republic, Slovakia, and Bulgaria).
Document 14: Russian language: In Georgia Russian has no official status, but it's recognised as a minority language under the Framework Convention for the Protection of National Minorities. According to estimates from Demoskop Weekly, in 2004 there were 130,000 native speakers of Russian in the country, and 1.7 million active speakers. 27% of the population was fluent in Russian in 2006, and 1% used it as the main language with family, friends or at work. Russian is the language of 9% of the population according to the World Factook. Ethnologue cites Russian as the country's de facto working language.
Document 15: Pagsanjan Falls: Pagsanjan Falls, also known as Cavinti Falls (indigenous name: Magdapio Falls) is one of the most famous waterfalls in the Philippines. Located in the province of Laguna, the falls is one of the major tourist attractions of the region. The three-drop waterfall is reached by a river trip on dugout canoe, known locally as "Shooting the rapids", originating from the municipality of Pagsanjan. The falls can also be reached from the top by a short hike from Cavinti. The boat ride has been an attraction since the Spanish Colonial Era with the oldest written account in 1894. The town of Pagsanjan lies at the confluence of two rivers, the Balanac River and the Bumbungan River (also known as the Pagsanjuan River).
ground_truth: 1809
sub_queries: Pihtsusköngäs >> country Answer: Finland
When did Finland join the Russian Empire? Answer: 1809