<P> The season ended with 11.08 million viewers ranking 36th overall in total viewers . This is much lower than the tenth season, which was ranked 15th . In the 18--49 key demographic, Grey's Anatomy ranked 13th down 8 places from the previous season, it is the lowest ranking in the series' history . For the 2014 - 2015 Primetime TV schedule, it was the no . 5 drama in the 18--49 key demographic . The season was well received among television critics with several praising the writing and performances of the cast, especially lead Ellen Pompeo . In terms of awards and accolades the season garnered six nominations at the 41st People's Choice Awards winning four including Favorite Network TV Drama, Dempsey and Pompeo won Favorite Dramatic TV Actor and Actress respectively and Oh winning for Favorite TV Character We Miss Most . On May 7, 2015, ABC announced the renewal of Grey's Anatomy for a twelfth season as part of their 2015 - 16 TV lineup . </P> <P> The season follows the story of surgical residents, fellows, and attendings as they experience the difficulties of the competitive careers they have chosen . It is set in the surgical wing of the fictional Grey Sloan Memorial Hospital, located in Seattle, Washington . </P> <P> The doctors at Grey Sloan Memorial must get used to the fact that Dr. Cristina Yang (Sandra Oh) is now in Switzerland, but they find it difficult to like her new replacement, Dr. Maggie Pierce (Kelly McCreary). She tries making friends with the doctors, but the one she's really interested in learning more about is her half - sister, Dr. Meredith Grey (Ellen Pompeo). Upon hearing Maggie's news, Meredith doesn't believe her . Trying to prove her wrong, Meredith pores over her mother's journals to see if there might have been any evidence of truth . What she finds is that the pieces fit, and that she and Maggie are in fact half - sisters . Not too keen on the fact that she has a sister whom she didn't know about until now, Dr. Derek Shepherd (Patrick Dempsey) uses his love for his big family to draw Meredith and Maggie together . </P> <P> Dr. Callie Torres (Sara Ramirez) and Dr. Arizona Robbins (Jessica Capshaw) talk about having another baby, but Arizona develops an interest in a fetal surgery fellowship . The fellowship is with Dr. Nicole Herman (Geena Davis), one of the only female fetal surgeons in the world . It's soon revealed that the reason Dr. Herman wanted Arizona to learn from her is that she has an inoperable tumor . The tumor is growing, and the prognosis is not good . In due time, the tumor would kill her . Trying to learn as much as she can in such little time, Callie and Arizona grow apart . They try to save their marriage by going to marriage counseling, but it doesn't work and they end up calling it quits . </P>

Where did cristina yang go in season 11