Question: La Bella portrait is housed in a Palazzo situated next to which river ?

Context paragraphs:
Paola Maltese: Paola María Elena Maltese Mongelos, known professionally as Paola Maltese (born 10 January 1984) is Paraguayan actress, presenter and entrepreneur.  Born in Asunción, she attended the Scuola Italiana Dante Alighieri  and majored in audio visual communication.  As a teenager she appeared in the TV series "Gonzalez vs. Bonetti", and she later landed a role in "La Chuchi".  On stage, she appeared in productions "Sorpresas", "Cinderella" ("La cenicienta") and "Beauty and the Beast" ("La bella y la bestia").

La Bella Nani: Portrait of a Venetian woman (La Bella Nani) is a painting depicting a wealthy noblewoman, painted by Paolo Veronese, ca. 1560.  The woman is dressed in the fashions of Venice at the time.  The identity of the sitter is unknown.

La Bella Principessa: La Bella Principessa (English: "The Beautiful Princess"), also known as Portrait of Bianca Sforza, Young Girl in Profile in Renaissance Dress and Portrait of a Young Fiancée, is a portrait in coloured chalks and ink, on vellum, of a young lady in fashionable costume and hairstyle of a Milanese of the 1490s.  Sold at auction in 1998 as an early 19th-century German work, some experts have since attributed it to Leonardo da Vinci.  In 2010 one of those experts, Martin Kemp, made it the subject of his book "La Bella Principessa: The Story of the New Masterpiece by Leonardo da Vinci".  Evidence discovered in 2011 accounting for its provenance has strengthened the case for it being by Leonardo; the sheet appears to have been cut from a Milanese book of which the remainder has long been in Warsaw, which comes from the "milieu" of Ludovico Sforza, Leonardo's employer.

Palazzo Pitti: The Palazzo Pitti (] ), in English sometimes called the Pitti Palace, is a vast, mainly Renaissance, palace in Florence, Italy.  It is situated on the south side of the River Arno, a short distance from the Ponte Vecchio.  The core of the present palazzo dates from 1458 and was originally the town residence of Luca Pitti, an ambitious Florentine banker.

Nissa La Bella: "Nissa la Bella" (Nice the Beautiful) is the unofficial anthem of the city of Nice, France.  It is written in Niçard, a dialect of Occitan that is the original language of the city.  It was written by Menica Rondelly in 1903, first under the title of "A la mieu bella Nissa"; the song takes its actual name in 1906, after some arrangements.

Beauty and the Beast (1987 film): Beauty and the Beast (alternatively: Cannon Movie Tales: Beauty and the Beast in United States, Die Schöne und das Biest in West Germany, La Bella e la Bestia in Italy, La Belle et la Bête in France) is a 1987 American/Israeli musical film, part of the 1980 film series Cannon Movie Tales.  It is a contemporary version of the classic tale of Beauty and the Beast.  The movie was filmed entirely in Israel, and the taglines were: ""The monster they feared was the prince she loved"" and ""The classic fairy tale about seeing with your heart"".

La Bella Mafia: La Bella Mafia is the third studio album by American rapper Lil' Kim, released on March 4, 2003 by Atlantic Records.  It debuted at number five on the US "Billboard" 200 chart, selling 166,000 copies in its first week.  A commercial success, "La Bella Mafia" was certified platinum by the Recording Industry Association of America (RIAA).  It was the best selling female rap album in 2003 with sales over 1 million copies in the United States and over 2 million copies worldwide.  To this date, the album has sold over 3 million copies worldwide.

Palazzo Bernardo a San Polo: The Palazzo Bernardo a San Polo, also known as the Giustinian Bernardo is a Gothic-style palace located between Palazzo Querini Dubois and across the Rio del la Madoneta, Casa Sicher, on the Grand Canal in the sestiere of San Polo of Venice, Italy.  It was built in the 14th century for the Bernardo family, a patrician family from Treviso, but putatively originally from Rome.  A separate Palazzo Bernardo, near the Ponte Bernardo but also in San Polo, was acquired in the 16th century by the Celsi family.  At this palace were housed Francesco Sforza and his wife, Bianca Visconti, during a grand state visit to Venice in May 1442.  In 1532, the palace lodged Lorenzo Strozzi, who then hosted a Medici Cardinal in a feast.  The palace was in the hands of the Bernardo till 1868.

Palazzo Isnello: Palazzo Isnello (also known as Palazzo Termine d'Isnello or Palazzo Sant'Antimo al Cassaro) is an historic palazzo situated between the ancient via del Cassaro and Piazza Borsa, in the Kalsa quarter of Palermo, Sicily.

La Bella: La Bella is a portrait of an unknown woman by Titian, painted around 1536 and now in the Palazzo Pitti in Florence.  The work of a mature artist, it shows the woman with Renaissance ideal proportions and a natural expressive force.  The composition is clear.

Supporting paragraphs: La Bella Palazzo Pitti
Answer: River Arno