The Spree (] ; Sorbian: "Sprjewja" , Czech: "Spréva" ) is a river that flows through the Saxony, Brandenburg and Berlin states of Germany, and in the Ústí nad Labem region of the Czech Republic.
 Approximately 400 km in length, it is a left bank tributary of the River Havel, which itself flows into the Elbe and then the North Sea.
 It is the river on which the original centre of Berlin was built.
Berlin ( , ] ) is the capital and the largest city of Germany as well as one of its 16 constituent states.
 With a population of approximately 3.7 million, Berlin is the second most populous city proper in the European Union and the seventh most populous urban area in the European Union.
 Located in northeastern Germany on the banks of the rivers Spree and Havel, it is the centre of the Berlin-Brandenburg Metropolitan Region, which has roughly 6 million residents from more than 180 nations.
Erik Pevernagie (born 1939) is a Belgian painter, living in Uccle/Ukkel (Brussels), who has held exhibitions in Paris, New York City, Berlin, Düsseldorf, Amsterdam, London, Brussels and Antwerp.
The Spandau Citadel (German: "Zitadelle Spandau" ) is a fortress in Berlin, Germany, one of the best-preserved Renaissance military structures of Europe.
 Built from 1559–94 atop a medieval fort on an island created by the meeting of the Havel and the Spree, it was designed to protect the town of Spandau, which is now part of Berlin.
 In recent years it has been used as a museum and has become a popular tourist spot.
Chain-boat navigation or chain-ship navigation is a little-known chapter in the history of shipping on European rivers.
 From around the middle of the 19th century, vessels called chain boats were used to haul strings of barges upstream by using a fixed chain lying on the bed of a river.
 The chain was raised from the riverbed to pass over the deck of the steamer, being hauled by a heavy winch powered by a steam engine.
 A variety of companies operated chain boat services on rivers such as the Elbe, Rhine, Neckar, Main, Saale, Havel, Spree and Saône as well as other rivers in Belgium and the Netherlands.
 Chain boats were also used in the United States.
Spandau (] ) is the fifth of the twelve boroughs ("Bezirke") of Berlin, Germany.
 It has the smallest population, and fourth largest in land area of the twelve boroughs.
 It is Berlin's westernmost borough, situated at the confluence of the Havel and Spree rivers and along the western bank of the Havel, but the least populated.
Altstadt Spandau is the historic centre (Old Town) of the Spandau borough in the western suburbs of Berlin, situated on the right bank of the Havel river by its confluence with the Spree tributary.
 It arose near the site of a former Slavic gord during the German eastward expansion ("Ostsiedlung") in the early 13th century.
 A castle at "Spandowe", erected on a Havel island to secure the eastern borderlands of the Margraviate of Brandenburg, was already documented in a 1197 deed issued by the Ascanian margrave Otto II.
The Pig, or Václav Havel's Hunt for a Pig is the final work by Václav Havel, co-authored by Vladimír Morávek.
 The English translation is by Edward Einhorn .
 Originally a short dialogue from 1987 (entitled simply "The Pig") and printed in a samizdat, the piece is a comic (and true) story of Václav Havel’s efforts to hold a pig roast for his friends.
Spree is the Annual Sports Festival of BITS Pilani, Goa Campus.
 It is a three-day long fest usually held in March.
 Since its inception in 2007, it has grown to become the largest collegiate sports festival in India; attracting many national as well as international participants.
 The theme has always been "Pure Sport", while the tagline for the upcoming season – Spree'17 is "Summon your Champion".
 The 2014 edition of the festival received a footfall of more than 40,000 students from 120 colleges all over the country.
 Spree has always been recognized for the best teams from sportiest colleges across the country, top-notch badminton and tennis courts, a maintained cricket ground and a football ground maintained by Salgaonkar FC.
The Finow Canal (German "Finowkanal") is one of the oldest artificial waterways in Europe.
 The channel, about 50 km long, is in the German state of Brandenburg in the Barnim district.
 It was built for the first time in 1605 and connects the Oder and Havel rivers.
 The river Ragöse flows into the canal.

Question: Which country, home of the Spree and Havel rivers, did Erik Pevernagie hold an exhibition? 
Answer: Germany