Chanthu was a C3 tropical cyclone that formed in the East China Sea in 2021. The storm reached maximum sustained winds of 213 km/h (115 kt) with a minimum central pressure of 905 hPa. Tracking across the East China Seain the Western Pacific basin (, it potentially affected Japan, Korea, Taiwan and eastern China. The storm traveled from approximately 13.3°121.5° to 34.5°139.4°, crossing a range of 21 latitude and 18 longitude.