The Inner Ring is one of the first areas created in Manyland. Only Rank 5 Manyzens can edit in here, but everybody can visit here. Before, only Rank 5 Manyzens could visit the area.
The Inner Ring features very old structures such as Castle Brown (by CKB) because it's not an open-edits area. In addition, its Manymeter centre isn't where the Ring Portals are - it's some 400 Manymeter away from the real centre.
Before the Outer Ring Areas were made easier to visit and player-created areas were introduced, players had to explore Area 1 and gain Rank 5 before being allowed to access other areas via portals in the Inner Ring.