Question: How large is the forest where the bodies of the victims of the Backpacker murders were found?

Context paragraphs:
Backpacker murders: The backpacker murders were a spate of serial killings that took place in New South Wales, Australia, between 1989 and 1993, committed by Ivan Milat.  The bodies of seven missing young people aged 19 to 22 were discovered partially buried in the Belanglo State Forest, 15 km south west of the New South Wales town of Berrima.  Five of the victims were foreign backpackers visiting Australia (three German, two British), and two were Australian travellers from Melbourne.

Mark Tedeschi: Mark Alfred Guido Tedeschi, AM, QC (born 1952) is an Australian barrister, law professor, photographer and author.  He has won numerous awards for his photography and has been featured in galleries throughout the world including in the State Library of New South Wales, the New South Wales Art Gallery, the Center for Fine Art Photography in Colorado, and the National Library in Canberra.  He is the Senior Crown Prosecutor for New South Wales and the Head of Chambers of the 84 Crown Prosecutors.  He is the founder and president of the Australian Association of Crown Prosecutors and a visiting professor at the University of Wollongong.  As a prosecutor, Tedeschi is best known for the prosecution of numerous high-profile cases in Australia including the 2006 conviction of Dr. Suman Sood for illegal abortion and the Backpacker Murders committed by Ivan Milat in the 1990s.

Signal Mountain murders: The Signal Mountain murders refers to a widely publicized case in 1988 involving the shootings of Richard Mason, Kenneth Griffith, and Earl Smock near Chattanooga, Tennessee.  The men were missing and being searched for by their relatives when they did not come home.  The relatives followed a blood path to the bodies off Big Fork Road and later found the victims' ATVs in a separate location.  Their bullet-ridden bodies and ATVs were found in the woods of Signal Mountain near Roberts Mill Road.  The three men had been riding along trails, portions of which crossed private property, planning on going for a swim.

Belanglo State Forest: Belanglo State Forest is a planted forest, of mainly pine but some native forestry around the edges in the Australian state of New South Wales; its total area is about 3,800 hectares.  The Belanglo State Forest is located south of Berrima in the Southern Highlands, three kilometres west of the Hume Highway between Sydney and Canberra.  The forest is owned by the New South Wales Government and contains some of the earliest pine plantings in the state.  The public has free access to the forest; it features two to four wheel drive tracks, creek crossings, and forest camping.  It is popular among recreational trail bike riders.

Russell bodies: Russell bodies are eosinophilic, large, homogeneous immunoglobulin-containing inclusions usually found in a plasma cell undergoing excessive synthesis of immunoglobulin; the Russell body is characteristic of the distended endoplasmic reticulum.  They are found in the peripheral areas of tumors.  Russell bodies are thought to have originated as an SOS compartment, where abnormal proteins that are not secreted, but have fled intracellular degradation, can gather without blocking normal secretory pathways.  The excess immunoglobulin builds up and forms intracytoplasmic globules, which is thought to be a result of insufficient protein transport within the cell.  This causes the proteins to neither be degraded or secreted and stay stored in dilated cisternae.  In 1949, Pearse discovered that Russell bodies also contain mucoproteins that are secreted by plasma cells.  Russell bodies are not tissue specific; during research they were induced in rat glioma cells.  Russell bodies were found to have positive reactions to PAS stain, CD 38 and CD 138 stains.  Plasma cells that contain Russell bodies and are stained with H&E stain are found to be autofluorescent, while those without Russell bodies are not autofluorescent.  Russell bodies tend to be found in places with chronic inflammation.  Multiple aggregrates of Russell bodies create what are known as Mott cells.

Smiley face murder theory: The Smiley face murder theory (variations include Smiley face murders, Smiley face killings, Smiley face gang, and others) is a theory advanced by two retired New York City detectives, Kevin Gannon and Anthony Duarte, that a number of young men found dead in bodies of water across several Midwestern American states over the last decade did not accidentally drown, as concluded by law enforcement agencies, but were victims of a serial killer or killers.  The term "smiley face" became connected to the alleged murders when it was made public that the police had discovered graffiti depicting a smiley face near locations where they think the killer dumped the bodies in at least a dozen of the cases.  The response of law enforcement investigators and other experts to Gannon and Duarte's theory has been largely skeptical.

Catching Milat: Catching Milat is a two-part Australian television miniseries that screened on the Seven Network, in collaboration with "Screen Australia" on 17 and 24 May 2015.  It is based on the book "Sins of the Brother" by Mark Whittaker and Les Kennedy and is loosely based upon the true story of how NSW Police and detectives under "Task Force Air" tracked down and caught serial killer Ivan Milat, who was responsible for the infamous backpacker murders.

Redhead murders: The "Redhead murders" are a series of unsolved homicides believed to have been committed by an unidentified serial killer in various parts of the United States, including Tennessee, Arkansas, Kentucky, Mississippi and Pennsylvania.  It is presumed that the killings occurred between October 1978 and the 1980s, but they may have continued until 1992.  The victims, many of whom have never been identified, usually had reddish hair and their bodies were abandoned along major highways in the United States; presumably, they were hitchhiking or engaged in prostitution.  Authorities are unsure of how many people were responsible for these murders, if they were all performed by the same perpetrator(s), or how many victims there were.  It is believed that a total of six to eleven victims were involved.

Winnie Ruth Judd: Winnie Ruth Judd (born Winnie Ruth McKinnell, Oxford, Indiana, January 29, 1905 – October 23, 1998) was a Phoenix, Arizona medical secretary accused of murdering her friends Agnes Anne LeRoi and Hedvig Samuelson in October 1931, allegedly over the affections of Jack Halloran, a prominent Phoenix businessman.  The murders were discovered when Judd transported the victims' bodies, one of which had been dismembered, from Phoenix to Los Angeles by train in trunks and other luggage, causing the press to name the case the "Trunk Murders".  She was tried for LeRoi's murder, found guilty, and sentenced to death, but the sentence was later repealed after she was found mentally incompetent, and she was committed to the Arizona State Asylum for the Insane (later renamed the Arizona State Hospital).  Over the next three decades, she escaped from the asylum six times, the final time during the 1960s when she remained at large for over six years and worked under an assumed name for a wealthy family.  She was ultimately paroled in 1971 and discharged from parole in 1983.

Ipswich serial murders: The Ipswich serial murders took place between 30 October and 10 December 2006, during which time the bodies of five murdered women were discovered at different locations near Ipswich, Suffolk, England.  All of the victims were women who had worked as prostitutes in the Ipswich area.  Their bodies were discovered naked, but there were no signs of sexual assault.  Two of the victims, Anneli Alderton and Paula Clennell, were confirmed to have been killed by asphyxiation.  A cause of death for the other victims, Gemma Adams, Tania Nicol and Annette Nicholls, was not established.

Supporting paragraphs: Backpacker murders Belanglo State Forest
Answer: 3,800 hectares