Question: What country borders the northwest region of the country in which lake Vuohijärvi is located?

Context paragraphs:
Bali Nyonga: Bali Nyonga is a town in the Northwest Region of the country Cameroon on the West Central borders on the continent of Africa.  It is the home of the Bali Nyonga, (a warrior clan) people of the Chamba Leko group - an entity that migrated from Chamba around 1600.  Their language is known as mungaka.  In the 19th century, they took advantage of German colonizers to raid surrounding villages and expand their kingdom, while providing the germans with captured slaves to work on southern, German owned plantations.  Their warrior nature terrorized their neighbours as they forcefully expanded their territory in disregard of already established communities.

Saskatchewan Highway 903: Highway 903 is a provincial highway in the northwest region of the Canadian province of Saskatchewan.  It begins at Highway 55 in Meadow Lake No. 588, east of the town of Meadow Lake, and heads north to Upper Cumins Lake.  Along the way, it intersects Highway 941, Highway 904, and Highway 965 (at Cole Bay, on the south side of Canoe Lake), and provides access to Waterhen Lake regional park, and Indian Reserve IR 130.  Highway 903 is about 179 km (111 mi) long.

West Region (Cameroon): The West Region (French: "Région de l'Ouest" ) is 14,000 km² of territory located in the central-western portion of the Republic of Cameroon.  It borders the Northwest Region to the northwest, the Adamawa Region to the northeast, the Centre Region to the southeast, the Littoral Region to the southwest, and the Southwest Region to the west.  The West Region is the smallest of Cameroon's ten regions in area, yet it has the highest population density.

Lake Nyos: Lake Nyos is a crater lake in the Northwest Region of Cameroon, located about 315 km northwest of Yaoundé.  Nyos is a deep lake high on the flank of an inactive volcano in the Oku volcanic plain along the Cameroon line of volcanic activity.  A volcanic dam impounds the lake waters.

Vuohijärvi: Vuohijärvi is a lake in Southern Finland.  It is located on the border between the regions of Southern Savonia and Kymenlaakso, with the majority of the lake lying in Kymenlaakso.  It is quite deep in comparison with other lakes in the region, with a maximum depth of 75.51 m making it the 7th deepest lake in Finland.  The ecological condition of the lake is good and the water is very clear.  There are approximately 90 islands, the largest being Kinansaari.

Finland: Finland ( ; Finnish: "Suomi" ] ; Swedish: "Finland" ] ), officially the Republic of Finland, is a sovereign state in Northern Europe.  The country has land borders with Sweden to the northwest, Norway to the north, and Russia to the east.  Estonia is south of the country across the Gulf of Finland.  Finland is a Nordic country situated in the geographical region of Fennoscandia, which also includes Scandinavia.  Finland's population is 5.5 million (2016), and the majority of the population is concentrated in the southern region.  88.7% of the population is Finnish and speaks Finnish, a Uralic language unrelated to the Scandinavian languages; the second major group are the Finland-Swedes (5.3%).  It is the eighth largest country in Europe and the most sparsely populated country in the European Union.  Finland is a parliamentary republic with a central government based in the capital Helsinki, local governments in 311 municipalities, and an autonomous region, the Åland Islands.  Over 1.4 million people live in the Greater Helsinki metropolitan area, which produces a third of the country's GDP.

Geography of Kazakhstan: Kazakhstan is located in Central Asia and Eastern Europe at .  With an area of about 2,724,800 square kilometers, Kazakhstan is more than twice the combined size of the other four Central Asian states, or about twice the size of Alaska.  The country borders Turkmenistan, Uzbekistan, and Kyrgyzstan to the south; Russia to the north; Russia and the Caspian Sea to the west; and China's Xinjiang Uygur Autonomous Region to the east.

Northwestern Columbus, Ohio: Northwest Columbus is a geographic region located in the northwest region of Franklin County, Ohio.  The Northwest Civic Association, founded in 1967, acts as the commission of this area.  It is bounded by the Scioto River on the west, the Olentangy River on the east, State Route 161 on the north, and Highland Drive and Henderson Road on the south.  Northwest Columbus includes parts of Perry Township and Sharon Township, the City of Dublin, and the City of Worthington.  Slightly more than 45,000 citizens live within this area according to the 2010 U.S. census.

Hòa Bình Province: Hòa Bình (] ) is a mountainous province of Vietnam, located in the nation's Northwest region.  It borders Phú Thọ Province and Sơn La Province to the northwest, Hanoi to the northeast, Hà Nam Province to the east, Ninh Bình Province to the southeast and Thanh Hóa Province to the south.  In 2004, the GDP per capita of the province was estimated to be $228 (equivalent to 3.6 million Vietnamese đồng).

Great Northwest Athletic Conference: The Great Northwest Athletic Conference (GNAC) is a collegiate athletic conference which has historically operated in the northwestern United States, but also currently includes four schools in areas not usually considered part of that region—two in Alaska (neither of which is located in Southeast Alaska, an area often considered part of the Northwest), one in eastern Montana (almost never considered part of the region), and one in the Canadian province of British Columbia (an area included with the Northwest U.S. in the larger Pacific Northwest region).

Supporting paragraphs: Vuohijärvi Finland
Answer: Sweden