What is the process for extending a 60-day tourist visa in Thailand, and what documents are required?

To extend a 60-day tourist visa in Thailand, you can apply for a 30-day extension at an immigration office. You need to visit the office during the last 30 days of your current visa validity. Required documents typically include: your passport, a copy of the ID page, a copy of the entry stamp, a copy of your visa page or email confirmation, the TM6 Departure card, 1 passport-sized photo, and a fee of 1,900 THB. Some offices may also require proof of residence, such as a copy of your address registration.