Lista över fyrkanter på Io

Io har delats upp i 15 fyrkanter .

namn	siffra	Latitudintervall	Longitudintervall	Namne	Funktioner
	Ji1	65,5°–90° N	Allt
Ruwa Patera	Ji2	21,5°–65,5° N	0°–90° W	Ruwa Patera
	Ji3	21,5°–65,5° N	90°–180° W		Shango Patera , Amirani , Thor , Zamama
	Ji4	21,5°–65,5° N	180°–270° W		Thomagata Patera
	Ji5	21,5°–65,5° N	270°–360° W		Amaterasu Patera , Fuchi Patera , Kinich Ahau Patera , Manua Patera , Dazhbog Patera , Surt
	Ji6	21,5° N – 21,5° S	0°–72° W		Kanehekili Fluctus
	Ji7	21,5° N – 21,5° S	72°–144° W		Chaac-Camaxtli-regionen , Monan Patera , Tawhaki Vallis , Ah Peku Patera , Gish Bar Patera , Maui Patera , Tawhaki Patera , Tupan Patera
	Ji8	21,5° N – 21,5° S	144°–216° W		Chaac-Camaxtli-regionen , Prometheus
	Ji9	21,5°N – 21,5°S	216°–288° W		Asha Patera , Kami-Nari Patera , Reiden Patera , Pillan Patera , Pele
	Ji10	21,5° N – 21,5° S	288°–360° W		Loke Patera
	Ji11	21,5°–65,5° S	0°–90° W		Masubi
	Ji12	21,5°–65,5° S	90°–180° W
	Ji13	21,5°–65,5° S	180–270° W		Mithra Patera , Pyerun Patera , Svarog Patera , Egypten Mons , Donau Planum
	Ji14	21,5°–65,5° S	270–360° W		Babbar Patera , Viracocha Patera , Euboea Montes , Silpium Mons
	Ji15	65,5°–90° S	Allt