Turtleback or Turtle-back tombs or turtle shell tombs (simplified Chinese: 龟壳墓; traditional Chinese: 龜殼墓; pinyin: guī ké mù; Pe̍h-ōe-jī: ku-khak-bōng; Okinawan: カーミナクーバカ, kaaminakuubaka) are a particular type of tombs originating from the Song Dynasty. They are commonly found in some coastal provinces of southern China (Zhejiang, Fujian, Guangdong), the Ryukyu Islands of Japan, and in Vietnam. They can also be found in countries with overseas Chinese populations like Malaysia.