The Mannyaku-yama incident was the incident in which a dispute concerning a pine tree in the Kume-mura village in Suo Province caused a territory boundary-related dispute, further developing to the abolishment of the Tokuyama clan in 1715.
万役山事件（まんにゃくやまじけん）は、正徳(日本)5年（1715年）、周防国の久米村万役山の松の木一本を巡る争いから、領界の争論を生じ、徳山藩改易にまで発展した事件。