In autumn in Beijing, Hongyan stops at Nanhaizi.

What you want to ask is when will Beijing Nanhaizi Hongyan stop? March. The article "Swan flies to Nanhaizi" on the website of Beijing Municipal People's Government said, "On March 22, 2022, dozens of swans swam and rested on the lake of Nanhaizi Park in Daxing, and hundreds of geese flew down from time to time", so the geese stopped at Nanhaizi in Beijing in March.