Ibi - Ibi

Japanese: イビ - いび

…In the Yaeyama Islands, sacred places equivalent to the Utaki of Okinawa Island are called Ugan, Wan, or On. The center of the Utaki is called Ibe or Ibi, where natural stones and other objects are enshrined, and an incense burner is placed in front of them. Noro, Negami, Tsukasa, and other female deities are forbidden to approach the area, and it is also taboo to pick up dead wood at the Utaki. …

From [Tree Worship]

...The original form of festivals is when the spirit of a god visits the festival grounds, as seen in the Shinto rituals of erecting pillars, setting up sakaki trees, and arranging brushwood. In Okinawa's Otake, there is a sacred area called Ibi, where a god descends upon a towering Kuba tree. Within the shrine grounds, there is a sacred tree surrounded by a sacred rope. ...

*Some of the terminology explanations that mention "Ibi" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…八重山の島々では，沖縄本島の御嶽にあたる聖地がウガンとかワン，オンとよばれている。御嶽の中心はイベまたはイビとよばれ，そこに自然石などがまつられ，その前に香炉が置かれている。のろ，根神，ツカサなどの女性神役以外は，そこに近づくことが禁じられているが，御嶽で枯木を拾うこともタブーになっている。…