Tibet

Region · Earth · position approximate (fictional or vague in the sources)

Comics

Silver After a car accident ended his surgical career, Strange travelled to Tibet, accepted the Ancient One's offer to teach him sorcery, and later took up residence in the Sanctum Sanctorum in New York. (Doctor Strange, permalink)
Silver Kaecilius goes with Mordo to Kamar-Taj in Tibet to kidnap the Ancient One, but Doctor Strange escapes with him. (Kaecilius, permalink)
Modern Raised in Bavaria by his grandfather Krowler after his father's murder, Mordo is sent to Tibet at eighteen to find the Ancient One, and later sacrifices his mother and grandfather to Dormammu. (Karl Mordo, permalink)
Modern Dying of cancer, Mordo returns to Tibet, seeks forgiveness from Strange and others, and dies at peace. (Karl Mordo, permalink)