Question: What country are both Kopparvallen and Conny Torstensson from?
Context: Adriana "Diana" van der Plaats (born August 12, 1971 in Utrecht) is a former freestyle swimmer from the Netherlands, who competed in two consequentive Summer Olympics for her native country, starting in 1988.  There she won the silver medal with the Dutch 4×100 m freestyle relay team, behind East Germany, after swimming in the qualifying heats.  In the final she was replaced by Conny van Bentum.  Three years later Van der Plaats captured the title in the 4×100 m freestyle relay at the 1991 European Aquatics Championships in Athens, Greece, and won the bronze in the 4×200 m freestyle relay. Conny Torstensson (born 28 August 1949) is a former footballer from Sweden.  With Sweden he participated at the World Cups 1974 FIFA World Cup and 1978 FIFA World Cup.  With Åtvidabergs FF he won national titles.  Later he belonged to the side of Bayern Munich which dominated international club football in the mid-1970s. Regina Constance "Reggie" de Jong (born 7 January 1964) is a former freestyle swimmer from the Netherlands, who competed for her native country in the 1980 Summer Olympics.  There she won the bronze medal in the 4×100 m freestyle relay, alongside Conny van Bentum, Annelies Maas and Wilma van Velsen.  Her best individual finish was the fifth place (2:02.76) in the 200 m freestyle.  In 1983, she won a bronze medal in the 4 × 200 m freestyle relay at the 1983 European Aquatics Championships. Cornelia "Conny" van Bentum (born August 12, 1965 in Barneveld) is a former butterfly and freestyle swimmer from the Netherlands, who competed in three consecutive Summer Olympics for her native country, starting in 1980.  At each of those swimming tournaments she won a medal with the 4×100 m freestyle relay team: one bronze (1980), and two silvers (1984 and 1988). Cornelia Dumler (born January 22, 1982 in Feuchtwangen), nicknamed "Conny", is a volleyball player from Germany, who represented her native country in at the 2004 Summer Olympics, finishing in ninth place.  Standing at 180 cm , she played as an outside-hitter for the German Women's National Team since 2002. Margot Wilhelmina ("Wilma") Teunisje van Velsen (born 22 April 1964 in Tiel, Gelderland) is a former butterfly and freestyle swimmer from The Netherlands, who twice competed for her country at the Summer Olympics, starting in 1980 in Moscow, Soviet Union.  There she won the bronze medal in the 4×100 m freestyle relay, alongside Conny van Bentum, Annelies Maas and Reggie de Jong.  Four years later in Los Angeles, United States she was a member of the silver winning team in the same event, although she just swam in the qualifying heats to bring The Netherlands to the final.  There the team was made up by Conny van Bentum, Desi Reijers, Annemarie Verstappen, and Elles Voskes. Kopparvallen is a multi-use stadium in Åtvidaberg, Sweden.  It is used mostly for football matches and is the home stadium of Åtvidabergs FF.  The stadium holds 8,000 people and was built in 1907.  Famous football players who have played in the arena is Ralf Edström, Roland Sandberg, Conny Torstensson, Zlatan Ibrahimović and Pelé.
Answer: Sweden