 The Daihimonjiyaki (大火文字焼き) is part of the "Noyaki" (のやき, burning of the hills) that occurs in Aso, at the beginning of March every year.The hills are burnt to stop the growth of trees allowing the grass to take over, thereby maintaining Aso's famous grasslands.The kanji (Chinese character) for fire "Hi" (火)、and the character for flame "Hono" (炎) is lit onto Ojo-dake and Motozuka (known locally as Kitazuka) which are two hills, on the second Saturday of March every year.