Question: Where is the legendary giant anaconda discovered that Vincent Castellanos, the American actor best known for his role in Anaconda from?

Context paragraphs:
Jake Canuso: Jake Canuso (born Carmine Canuso; 13 January 1970) is a English actor and dancer, who is best known for his role in the Benidorm-based British TV series "Benidorm", in which he plays barman Mateo Castellanos.

Bruno (bear actor): Bruno, also called Ben or Gentle Ben (1962− c. 1981) was a male American black bear actor best known for playing the leading role of Ben the bear in the 1967-1969 CBS television series, "Gentle Ben".  He also played the adult Ben in the feature film prequel to the TV series, "Gentle Giant" (1967).  In 1968, Bruno received a first-place PATSY Award for his work on the "Gentle Giant" film and a second-place award for his work on the TV series.  After the "Gentle Ben" series ended, Bruno made another well-received appearance in the 1972 John Huston-directed film "The Life and Times of Judge Roy Bean", starring Paul Newman.

Vincent Castellanos: Vincent Castellanos (born August 7, 1961) is an American actor.  Castellanos is best known for his role as Mateo in the adventure-horror film Anaconda.

Jan-Michael Vincent: Jan-Michael Vincent (born July 15, 1944) is a retired American actor best known for his role as attack helicopter pilot Stringfellow Hawke on the television series "Airwolf" (1984–86) and as the protagonist of 1978's " Big Wednesday".

Anaconda (film): Anaconda is a 1997 adventure horror film by Peruvian director Luis Llosa, starring Jennifer Lopez, Ice Cube, Jon Voight, Eric Stoltz, Jonathan Hyde and Owen Wilson.  It centers on a documentary film crew who have been taken hostage by a snake hunter who is going after the legendary giant anaconda, which is discovered in the Amazon rainforest.

John Castellanos: John Castellanos (born April 11, 1957 in La Mesa, California) is an American actor best known for the contract role of attorney John Silva on the CBS soap opera "The Young and the Restless".  He joined the cast in May 1989 and has appeared in an estimated 1,300 episodes.  He had previously portrayed attorney Jeff Talon on "The Bold and the Beautiful" in several episodes in 1987.

Charles Howerton: Charles Howerton is an American actor best known for such films and television series as "The Black Gestapo", "Eat My Dust", "Up from the Depths", "Smokey Bites the Dust", "Dr. Heckyl and Mr. Hype", "", "Wolfen", "Assassination" and "The Iron Giant".

P. J. Boudousqué: Philip John "P. J." Boudousqué is an American actor best known for his leading role as Brad Lunders in director Vincent Grashaw's 2013 film Coldwater.  Boudousqué was born in Louisiana.  He spent his youth in New Orleans, where he performed alternative music before moving to Los Angeles with his family in August 2005 after Hurricane Katrina.

Lincoln A. Castellanos: Lincoln A. Castellanos (born August 20, 1988) is an American actor perhaps best known for his work on such television series and films as "Fear the Walking Dead" as Tobias, "The Mentalist", and "I Am Gangster".

Kerwin Mathews: Kerwin Mathews (January 8, 1926 – July 5, 2007) was an American actor best known for playing the titular heroes in "The 7th Voyage of Sinbad" (1958), "The Three Worlds of Gulliver" (1960) and "Jack the Giant Killer" (1962).

Supporting paragraphs: Vincent Castellanos Anaconda (film)
Answer: Amazon rainforest