The rulers of all the Kami are the Heavenly Kami, or Amatsukami. They are led by Amaterasu, who rules over the High Plain. Not much is known about the place, as few who are not Kami, and many Kami themselves, never travel there. Amaterasu has her palace there along with her rice fields, dikes, and various important buildings for carrying on life.
There is also a great river that flows through heaven, but it has been dammed up so that the Heavenly Kami can all collect there and discuss important matters. It is a fantastic place, but much like the land of early Japan. To get there one must cross the Heavenly Bridge, which is the Milky Way. Somewhere along that route is the eightpath crossroads where Sarutahiko confronted Ninigi-no- Mikoto’s procession to Earth.