The Bukkokuhon (the chapter of Buddha-land) "Yuimagyo (Vimalakirti Sutra)" describes that 'there are hillside, mine-pit halls, thorns, a million stones, earth and sand, many mountains and all filled with impurities.'
『維摩経』仏国品では、「丘陵、坑坎、荊棘、沙礫、土石、諸山ありて、穢悪充満せり」という。