Shabbos Daf 7 שבת דַף 7

R’ Yochanan identifies the karmelis listed as one of the karmelis areas as a nook adjacent to a reshus harabim. Although the public sometimes pushes their way into this area and enter it, since it is not convenient it is a karmelis.

The Rabbis were lenient when decreeing the parameters of a karmelis, applying one of the leniencies of a reshus hayachid and one of the leniencies of a reshus harabim. 

- Rav Dimi said in the name of R’ Yochanan that a karmelis must be at least four tefachim wide, similar to the requirement for a reshus hayachid. If it less than four tefachim it has the status of a makom petur.
- Rav Sheishess said the airspace of karmelis is only considered a karmelis until ten tefachim, similar to the laws of a reshus harabim. The area above a reshus harabim has the status of a makom petur.

Crevices in a reshus hayachid (חורי רשות היחיד) have the status of reshus hayachid.
Crevices in a reshus harabim (חורי רשות הרבים):
    - Abaye says they are treated as a reshus harabim since the public sometimes uses them as a convenient place to store items.
    - Rava says their measurement determines their status. If they are less than four tefachim wide they have the status of a makom petur. If they are four tefachim or wider then they are treated as a karmelis.