Xirang (Chinese: 息壤; pinyin: xīrǎng) (also known as Swelling Earth) is a magical substance in Chinese Mythology, according to which it had an a self-expanding ability to continuously grow, which made it particularly effective for use by Gun and Yu in fighting the rising waters of the Great Flood. This Chinese word compounds xi息 "breathe; cease; rest; grow; multiply" and rang壤 "soil; earth". Noting similarities with Earth-diver creation myths, Anne Birrell translates xirang as "self-renewing soil", and compares other translations of "breathing earth" (Wolfram Eberhard), "swelling mold" (Derk Bodde), "idle soil" (Roger Greatrex), and "living earth" or "breathing earth" (Rémi Mathieu).
In some versions of the myths, Gun stole the Xirang from Huangdi, the Yellow Emperor, who sent Zhurong to execute him in punishment, on Feather Mountain (Yushan). Yu, on the other hand (according to some accounts) went up to Heaven; then, after begging Huangdi he received from him a gift of as much Xirang as his magical black tortoise could carry on its back: thus allowing Yu to successfully block up the 233,559 springs, which were sources of the flood waters. In other versions of these myths, Xirang was stolen or obtained from the Supreme Divinity, or Gun's executioner was other than Zhurong.