At which place in Karnataka did Adi Shankaracharya establish the first of four mathas?

Q. At which place in Karnataka did Adi Shankaracharya establish the first of four mathas?
Answer: Sringeri
Notes: Adi Shankaracharya is believed to have established four mathas or the Advaita monasteries all across India to propagate his learnings to devotees. Among these four mathas, the first matha to be erected was the Sringeri Sharada Peetham in Karnataka.