I want to know the answer to the following question:
Which frontier did the Tumed Mongols raid?
All the background I'm provided with is that "Meanwhile, the Tumed Mongols began moving into the Kokonor region (modern Qinghai), raiding the Ming Chinese frontier and even as far as the suburbs of Beijing under Altan Khan (1507–1582).". Is that enough to answer the question?
Answer: yes