Question: In what mountains is the Barkley Marathon held?  
Context: The Austin Marathon is an annual marathon held in Austin, Texas.  It was founded in 1991 by Freescale Semiconductor, who served as title sponsor for fifteen years.  The marathon was sponsored by AT&T in 2007 and 2008, but ran with no title sponsor in 2009.  From 2010 to 2013, the race was called the LIVESTRONG Austin Marathon.  Freescale returned as presenting sponsor in 2014 and 2015.  NXP Semiconductors and Freescale completed their merger in December 2015, with NXP becoming the presenting sponsor for 2016 and 2017.  The Austin Half Marathon and Austin Marathon 5K are also part of the event.  The Austin Marathon annually hosts runners from all 50 states and more than 20 countries around the world.  The Austin Marathon presented by NXP will take place on February 19, 2017. The Rock 'n' Roll Denver Marathon is an annual marathon held in Denver, Colorado.  The Rock 'n' Roll Denver Marathon replaced the Denver Marathon in 2010.  The Denver Marathon was first established in 2006, when nearly 1,200 people participated in the main marathon event.  Additionally, over 1,700 took part in the half marathon that year.  Other events include a four leg relay marathon and a kids race. Jakarta Marathon, officially Mandiri Jakarta Marathon, is the marathon held annually in Jakarta, the capital city of Indonesia in Southeast Asia.  The marathon is recognised by Association of International Marathons and Distance Races (AIMS) and International Athletic Association Federation (IAAF).  Marathon is organised by tourism ministry of Government of Indonesia.  In 2015, the race was held on 25 October, and more than 15,000 people from 53 countries participated in the 2015 marathon.  The Jakarta Marathon is aimed to project Jakarta as "world class" tourist destination, especially in sport tourism, and is regarded as the "biggest running event of Indonesia". Kazbegi Marathon is an annual marathon held in Georgia during the month of September.  The marathon courses through the Caucasus Mountains in the northern part of the country, the starting and finishing points are in the town of Kazbegi located on the historical military road on the foot of Kazbegi Mountain.  The Kazbegi Marathon is both the largest as well as the first racing event held in the Caucasus and includes four track lengths: full marathon, half marathon, 8km fun run and relay race on 42km distance.  The organizer of Kazbegi Marathon is "Tourist Agency Visit Georgia" Ltd.  The marathon is marketed to an international audience, previous races attracting participants from Germany, England, Japan and Israel.  Many local runners, from the neighboring Armenia and Azerbaijan participate as well. The Ladakh Marathon is a marathon held in Leh, a town in the Ladakh region in the Indian state of Jammu and Kashmir.  It claims to be the highest marathon in the world, held at a height of 11,500 to .  The fourth running of the Ladakh Marathon was held in 2015.  It is full member of Association of International Marathons and Distance Races.  The marathon was organised "to foster national spirit and to encourage sport in Ladakh".  It is the fifth marathon from India to get international recognition. Adriana Nelson, née Pirtea (born January 31, 1980) is a Romanian American long-distance runner who made her marathon debut in the Chicago Marathon held on October 7, 2007, with a second-place finish.  She led by a few dozen meters in the final 300 meter stretch run down Columbus Drive on a day of record-setting 88 °F temperatures, but she was caught just before the tape by the defending Chicago Marathon women's champion, Berhane Adere.  Pirtea had held a 30-second lead with 600 meters remaining but never looked back as Adere slipped down the right side of the final straightaway under the shield of male runners.  Adere was so far to the right that as she crossed the finish line she did not take the tape which was being held at the left side of the finish line.  The 2007 Chicago Marathon was the slowest women's Chicago finish since 1992 due to the heat.  Pirtea had been a pacemaker at the January 28, 2007, running of the Osaka Ladies Marathon, and an injury prevented her from making her marathon debut at the London Marathon on April 22, 2007. The Barkley Marathons is an ultramarathon trail race held in Frozen Head State Park near Wartburg, Tennessee.  Runners may elect a "fun run" of 60 mi or the full course of 100 mi (distances are approximate).  The race is limited to a 60-hour period, and takes place in late March or early April of each year. The Kolkata Marathon (officially IDBI Federal Life Insurance Kolkata Full Marathon) is a marathon held annually in Kolkata, West Bengal, India.  It was launched in 2008.  The marathon is the largest in Eastern India and the only full marathon held in Kolkata. The "Sydney Marathon" is a marathon held annually in Sydney, Australia each September.  The event was first held in 2001 as a legacy of the 2000 Summer Olympics, which were held in Sydney.  In addition to the marathon, a half marathon, 10 km "Bridge Run", and a 3.5 km "Family Fun Run" are also held under the banner of the Sydney Running Festival.  The marathon course record is held by Gebo Gameda of Kenya, who completed the race in 2 hours, 11 minutes and 18 seconds in 2014.  The fastest woman is the Ethiopian Biruktayit Degefa, who ran a time of 2 hours, 29 minutes and 42 seconds in 2014. Frozen Head State Park and Natural Area is a state park in Morgan County, Tennessee, in the southeastern United States.  The park, situated in the Crab Orchard Mountains between the city of Wartburg and the community of Petros, contains some of the highest mountains in Tennessee west of the Blue Ridge.
Answer: Crab Orchard Mountains