The area around Itoigawa is home to the most abundant jade in the country. The Kotakigawa Jade Gorge and Omigawa Jade Gorge sites within the city are nationally designated natural monuments and the unpermitted removal of jade is banned. Elsewhere, the parties that manage the rivers and seashores have tolerated taking small amounts of the gemstones. According to the Niigata Prefectural Government, outside the jade gorges, removal of soil and stones containing jade requires legal permission based on laws on rivers and seashores. However, the laws also hold that if the amount taken from rivers or shores is very small and collection is only temporary, permission could be deemed unnecessary within the scope of free use. The term "very small" is not concretely defined but is explained as an amount suitable to take as a keepsake for a trip.