Question: Garrison Keillor created which fictional town for "Prairie Home Companion"?

Context paragraphs:
A Prairie Home Companion with Chris Thile: The live weekly radio variety show, A Prairie Home Companion with Chris Thile, whose title indicates the new program host, musician Chris Thile, derives from the historic "A Prairie Home Companion with Garrison Keillor" ("APHC") radio show, where the changeover in the onstage hosting and program began on October 15, 2016.  Thile, an American virtuoso mandolinist and singer-songwriter, had a two decade history with "APHC" and is known for his work in the folk and progressive bluegrass groups Nickel Creek and Punch Brothers.  After two unprecedented guest host spots in 2015, Keillor decided on his successor, featured Thile as host again in January–February 2016, and fully ceded his hosting role to Thile in the October 2016 performance at the Fitzgerald Theater in St. Paul, Minnesota, continuing as the show's Executive Producer.  As of 1 November 2016, the new program presents expanded musical and comedic elements, retaining the template of the earlier program (e.g., its most recent acting and sound effect cast, and "sponsorships" from faux companies), but without such features as its earlier signature "Lives of the Cowboys" series and "News from Lake Wobegon" monologue.  Early reviews of the new program have been uniformly positive, focusing on the remaining familiar elements and on the new music and expanded musical focus brought by the new host.

A Prairie Home Companion: A Prairie Home Companion is a live weekly radio variety show hosted by musician and songwriter Chris Thile.  The program was created in 1974 by Garrison Keillor, who hosted it until 2016.  It airs on Saturdays from 5 to 7 p.m. Central Time, from the Fitzgerald Theater in Saint Paul, Minnesota; it is also frequently heard on tours to New York City and other US cities.  The show is known for its musical guests, especially folk and traditional musicians, tongue-in-cheek radio drama, and relaxed humor.  Keillor's wry storytelling segment, "News from Lake Wobegon", was the show's best-known feature during his long tenure.

Guy Noir: Guy Noir is a fictional private detective regularly featured on the public radio show "A Prairie Home Companion".  Voiced by Garrison Keillor, the character parodies the conventions of hardboiled fiction and the film noir genre.  Guy Noir works on the twelfth floor of the Acme Building in a city that "knows how to keep its secrets", St. Paul, Minnesota.

Vern Sutton: Vern Sutton (born April 8, 1938) is an American operatic tenor, opera director, and academic.  A founding member of the Minnesota Opera, he has created roles in the world premieres of several contemporary operas with that company; including works composed for his voice by Dominick Argento, Libby Larsen, Eric Stokes, Conrad Susa, and Robert Ward.  He was also a regularly featured singer on Garrison Keillor's "A Prairie Home Companion" for three decades, beginning with its first broadcast in 1974.

Aoife O'Donovan: Aoife O’Donovan ( ; ] ;) born November 18, 1982 in Newton, Massachusetts, is an Irish-American singer and songwriter.  She is best known as the lead singer for the progressive bluegrass/string band Crooked Still and as a member of the female folk-noir trio Sometymes Why.  Her first professional engagement was singing lead for the folk group The Wayfaring Strangers.  She has performed and recorded with Ollabelle, Karan Casey and Seamus Egan, Jerry Douglas, Jim Lauderdale, Darol Anger, Sarah Jarosz, Sara Watkins, Christina Courtin, Chris Thile (Nickel Creek, Punch Brothers), Noam Pikelny (Punch Brothers), Edgar Meyer, Stuart Duncan and Yo-Yo Ma.  O’Donovan has also performed with the Boston Pops Orchestra and the Utah Symphony Orchestra.  In 2012, she sang on most of the tracks on the album "Be Still" by the jazz group the Dave Douglas Quintet, featuring trumpeter Dave Douglas.  During the summer of 2013, she toured with Garrison Keillor and his "A Prairie Home Companion Radio Romance Tour."

Lake Wobegon: Lake Wobegon is a fictional town created by Garrison Keillor to provide the setting for the long-running radio broadcast, "Prairie Home Companion".  Lake Wobegon is also the setting for many of Keillor's stories and novels.  It is described as a small rural town in central Minnesota, and it is peopled with fictional characters and places, many that have become familiar to listeners of the broadcast.  The events and adventures of the imaginary townspeople provide the prolific Keillor with a wealth of stories, that are humorous and at times touching and thoughtful.

Lake Wobegon Trails: The Lake Wobegon Trails are two paved recreational rail trails in central Minnesota, named after the fictional Lake Wobegon in Garrison Keillor's "Prairie Home Companion".  Each trail is marked with mileposts every 0.5 mi , corresponding with the mile markers of the former railroad lines.  Snowmobile use is allowed on the trail in winter, conditions permitting.

Garrison Keillor: Gary Edward "Garrison" Keillor (born August 7, 1942) is an American author, storyteller, humorist, voice actor, and radio personality.  He is best known as the creator of the Minnesota Public Radio show "A Prairie Home Companion" (called "Garrison Keillor's Radio Show" in some international syndication), which he hosted from 1974 to 2016.  Keillor created the fictional Minnesota town Lake Wobegon, the setting of many of his books, including "Lake Wobegon Days "and "".  Other creations include Guy Noir, a detective voiced by Keillor who appeared in "A Prairie Home Companion" comic skits.

Tom Keith: Thomas Alan Keith (December 21, 1946 – October 30, 2011) was a radio personality who worked for Minnesota Public Radio in St. Paul, Minnesota.  He was the engineer for Garrison Keillor when the latter began his early morning radio show from the St. John's University, Collegeville, Minnesota studio.  Keillor wanted dialogue during the program and Keith was about the only other person around at that early hour.  Keith was one of the primary sound effects performers for the radio show "A Prairie Home Companion" and was often an actor in sketches written by Keillor.  Keillor created the persona of Jim Ed Poole for Keith on the old early morning show.  Jim Ed was said to have grown up in West St. Paul, Minnesota and graduated from Henry Sibley High School.

Lake Wobegon Days: Lake Wobegon Days is a novel by Garrison Keillor, first published in hardcover by Viking in 1985.  Based on material from his radio show "A Prairie Home Companion", the book brought Keillor's work to a much wider audience and achieved international success.  Like some of Keillor's other books, it is unusual in that it could be said that the audiobook preceded the publication in written form.

Supporting paragraphs: Garrison Keillor Lake Wobegon
Answer: Lake Wobegon