Question: In which area of Alton Towers is the Thirteen roller coaster located?

Context paragraphs:
Octonauts Rollercoaster Adventure: Octonauts Rollercoaster Adventure is a family roller coaster located in CBeebies Land at Alton Towers, Staffordshire.  It opened on 21 March 2015.  It is located next to Spinball Whizzer, in an area which was previously part of Adventure Land.  The ride is manufactured by Italian amusement ride company Zamperla and is themed around the children's television programme, "The Octonauts", which is aired on CBeebies.  It is a small family coaster, with a height of 6.5 metres and a 3-metre drop.  It contains no inversions.  The coaster replaces Beastie, which was removed in 2012.

Galactica (roller coaster): Galactica (formerly known as Air) is a flying virtual reality roller coaster located in the Forbidden Valley area of Alton Towers amusement park in Staffordshire, England.  Previously known as Air, it is the first flying coaster manufactured by Bolliger & Mabillard.  Guests ride in a prone position lying chest down and experience the feeling of flight by "flying" close to the ground, under footpaths, and narrowly past trees and rocks.

Colossus (Thorpe Park): Colossus is a roller coaster at Thorpe Park in Surrey, England, and the park's first major attraction.  It was built by Swiss manufacturers Intamin and designed by Werner Stengel as an adaptation of "Monte Makaya" in Brazil, with consultation from Tussauds attraction developer John Wardley.  "Colossus" was the world's first roller coaster with ten inversions; an exact replica, called the "10 Inversion Roller Coaster", was later built at Chimelong Paradise in Guangzhou, China.  It retained its title of having the most inversions on any other roller coaster in the world until "The Smiler" at Alton Towers took the record in 2013.

The Smiler: The Smiler is a steel roller coaster located at Alton Towers in Staffordshire, United Kingdom.  Manufactured by Gerstlauer, it features 14 inversions and holds the world record for most inversions on a roller coaster.  The Smiler has suffered a series of setbacks and ride incidents, including a malfunction at a press preview event which delayed the official opening date by two months, and a collision in 2015 which left five riders seriously injured.  An investigation by the HSE was initiated, and the ride was closed for the remainder of that season.  The ride eventually reopened on 19 March 2016 with revamped safety standards.

Corkscrew (Alton Towers): Corkscrew was a steel roller coaster manufactured by Dutch company Vekoma to a design by Arrow Dynamics.  The coaster was located in the Ug Land area of Alton Towers in Staffordshire, England.  It was the park's oldest ride and is considered the greatest factor in promoting the new theme park to the British public.  It was one of the first double-inverting coasters in Europe (the first in the UK), so it received much publicity and avid popularity in the 1980s.  Waiting times for the ride frequently reached 6–9 hours during the first few months of operation at Alton Towers, and the park would often be forced to close early as it found itself swamped with visitors long before the evening ever came.

Oblivion (roller coaster): Oblivion is a steel roller coaster located at Alton Towers in England.  The ride opened as the world's first dive coaster on 14 March 1998, amidst a large publicity campaign.  It was the second in a long line of 'Secret Weapon (SW4)' rollercoasters to have opened at Alton Towers.  The ride has a height restriction of 55 in .  With a maximum speed of 68 mph, it is the third fastest roller coaster in the UK, behind Stealth at Thorpe Park and the Big One at Blackpool Pleasure Beach.

Roller coaster inversion: A roller coaster inversion is a roller coaster element in which the track turns riders upside-down and then returns them to an upright position.  Early forms of inversions, dating as far back as 1848 on the Centrifugal Railway in Paris, were vertical loops that were circular in nature.  They produced massive g-force that was often dangerous to riders, and as a result, the element eventually became non-existent with the last rides to feature the looping inversions being dismantled during the Great Depression.  In 1975, designers from Arrow Development created the corkscrew, reviving interest in the inversion during the modern age of steel roller coasters.  Since then, the element have evolved from simple corkscrews and vertical loops to more complex inversions such Immelmann loops and cobra rolls. Featuring fourteen inversions, The Smiler at Alton Towers holds the world record for the number of inversions on a roller coaster.

Beast (Alton Towers): Alton Beast (later known as New Beast) was a roller coaster at Alton Towers.  It first opened in 1988 in the Talbot Street (now Cloud Cuckoo Land) section of the park with the "Alton Mouse", a second-hand wild mouse coaster, and was marketed by the park as the largest coaster in the UK.  It was a very popular ride, and it stayed in Talbot Street until 1992, when it was moved to Thunder Valley near the "Thunder Looper" (where the Rollercoaster Restaurant is now) and renamed the "New Beast".  In 1994, "Nemesis" opened and the area was changed into Forbidden Valley.  The "New Beast" stayed in Forbidden Valley until the end of 1997, when it was removed to make way for "Air", the park's 2002 flying coaster.It was later removed in 1999.  It was sent to Divertido in Mexico City as Space Mountain.  It was removed when the park closed in 2004.  In 2010, the Beast was reopened in Salitre Magico as the Tornado.

Nemesis (roller coaster): Nemesis is an inverted roller coaster located at the Alton Towers amusement park in England.  The ride's concept and layout was devised by designer John Wardley.  It was manufactured by Bolliger & Mabillard (B&M) and opened in March 1994.  It is located in the Forbidden Valley area of the park, adjacent to "Galactica" (Previously Air), a B&M flying roller coaster; Nemesis: Sub-Terra, a dark ride manufactured by ABC rides, and The Blade, a HUSS Park Attractions pirate ship ride.  This ride is adjacent to galactica and opposite the rollercoaster restaurant

Thirteen (roller coaster): Thirteen (officially stylised as TH13TEEN) is a steel roller coaster at Alton Towers in England.  The ride was constructed by Intamin and opened on 20 March 2010.  It is the world's first vertical freefall drop roller coaster, on which the track and train freefall approximately five metres in darkness.  The ride replaced and is built on the former site of the Corkscrew, which resided at Alton Towers for 28 years between 1980 and 2008.

Supporting paragraphs: Thirteen (roller coaster) Corkscrew (Alton Towers)
Answer: Ug Land