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Okirigishi
Kirigishi adalah tebing artifisial untuk mencegah serbuan musuh.
Tempat dengan tebing yang curam, memiliki ketinggian 3-10 meter, dan panjang lebih dari 800 meter.
Dalam beberapa tahun terakhir, telah ditemukan sisa-sisa tempat penggalian berskala besar sekitar abad 14.