Question: In what California county would you find Sara Hall's birthplace?

full_context: Document 1: Santa Rosa Creek Reservoir: Santa Rosa Creek Reservoir is a reservoir in Spring Lake Regional Park in the city of Santa Rosa, California, USA. It is impounded by an earthen dam built in 1963 and owned by the Sonoma County Water Agency.
Document 2: Sara Hall: Sara Hall (née Bei; born April 15, 1983 in Santa Rosa, California) is a professional American middle distance runner. She won the 3000 meter steeplechase in 10:03 at the 2011 Pan American Games in Guadalajara, Mexico representing the United States.
Document 3: Laura Walker: Walker was a member of the third-place United States women's relay team that won the bronze medal in the women's 4×100-meter freestyle relay at the 1988 Summer Olympics in Seoul, South Korea. Her winning teammates included Mary Wayte, Dara Torres and Mitzi Kremer.
Document 4: Milcah Chemos Cheywa: Milcah Chemos Cheywa (born 24 February 1986 in Bugaa, Mount Elgon District) is a runner from Kenya who specialises in 3000 metres steeplechase. She is African record holder at the distance and is the gold medalist of the 2013 World Championships in Athletics.
Document 5: San Francisco: San Francisco (initials SF) (/ ˌsæn frənˈsɪskoʊ /, Spanish for Saint Francis; Spanish: (san franˈsisko)), officially the City and County of San Francisco, is the cultural, commercial, and financial center of Northern California. The consolidated city - county covers an area of about 47.9 square miles (124 km), mostly at the north end of the San Francisco Peninsula in the San Francisco Bay Area. It is the fourth-most populous city in California, and the 13th-most populous in the United States, with a 2016 census - estimated population of 870,887. The population is projected to reach 1 million by 2033. As of 2016, San Francisco County was the 7th highest - income county in the United States, with a per capita personal income of $110,418.
Document 6: Rosenberg's Department Store: Rosenberg's Department Store is located at Fourth and D Streets in downtown Santa Rosa, California. The structure is the most significant example of the Streamline Moderne style in Santa Rosa, and was the tallest building in the city for many years.
Document 7: Santa Rosa, California: Santa Rosa is a city in and the county seat of Sonoma County, California, United States. Its estimated 2014 population was 174,170. Santa Rosa is the largest city in California's Redwood Empire, Wine Country and the North Bay; the fifth most populous city in the San Francisco Bay Area after San Jose, San Francisco, Oakland, and Fremont; and the 28th most populous city in California.
Document 8: Naval Auxiliary Landing Field Santa Rosa: Naval Auxiliary Landing Field (NALF) Santa Rosa, California, also known as Naval Auxiliary Air Station, Santa Rosa, was a military airport located in Santa Rosa, California, in Sonoma County, California, USA.
Document 9: Sara Harstick: Sara Harstick (born 8 September 1981 in Hildesheim, Niedersachsen) is a former German freestyle swimmer, who won bronze medals in the 2000 and 2004 Summer Olympics.
Document 10: Shelia Burrell: Shelia Burrell (born 15 January 1972 in Albuquerque, New Mexico) is a retired American heptathlete. She was a two-time representative of the United States at the Summer Olympics, competing in 2000 and 2004. Her best Olympic finish was fourth place. She also competed twice at the World Championships in Athletics, which included a bronze medal in 2001. She was also a two-time silver medalist at the 1999 Pan American Games. Her personal best for the heptathlon 6472 points and she was American national champion on four occasions.
Document 11: Santa Rosa Rugby Club: The Santa Rosa Rugby Club is a men's rugby union team based in and around Santa Rosa, California. The club was founded in 1971. The team plays in the Northern California Rugby Football Union at the Division I level. The Santa Rosa Rugby Club won back to back national championships in 1994-95.
Document 12: Santa Rosa, California: Santa Rosa (lit. Spanish for ``Saint Rose '') is a city in and the county seat of Sonoma County, in California's Wine Country. Its estimated 2016 population was 175,155. Santa Rosa is the largest city in California's Redwood Empire, Wine Country and the North Bay; the fifth most populous city in the San Francisco Bay Area after San Jose, San Francisco, Oakland, and Fremont; and the 28th most populous city in California.
Document 13: Kaye Hall: Hall was born in Tacoma, Washington, and attended Woodrow Wilson High School in Tacoma. She trained with the Tacoma Swim Club with coach Dick Hannula. Hall made her international debut at the 1967 Pan American Games in Winnipeg, where she won a silver medal in the 100-meter backstroke behind Canadian gold medalist Elaine Tanner. In December 1967, she became the first woman to swim the 100-yard backstroke in under one minute.
Document 14: Abeba Aregawi: Abeba Aregawi Gebretsadik (Amharic:አበባ አረጋዊ ;born 5 July 1990) is an Ethiopian-born middle-distance runner from Tigray, who specialised in the 1500 metres. Her personal best for the event is 3:56.54. Aregawi is the 2013 world champion over 1500 metres. She represented Sweden internationally.
Document 15: Graton, California: Graton is an unincorporated town and census-designated place (CDP) in west Sonoma County, California, United States. The population was 1,707 at the 2010 census. Graton's ZIP code is 95444. The town also has a culinary reputation attributed to two restaurants in the area.
ground_truth: Sonoma County
sub_queries: Sara Hall >> place of birth Answer: Santa Rosa
what part of california is Santa Rosa in Answer: Sonoma County