Differentiating between pits holding standing water and wells with springs: Eruvin 18a, 21a, 22b-23a
Differentiating between individually-owned wells and public wells: Eruvin 18a, 22b-23a
The size of the enclosed space: Eruvin 17b-18a, 19a-b, 19b, 20a-b
What happens if a private yard extends into the enclosed space: Eruvin 20a
What happens if two private yards extend into the enclosed space: Eruvin 20a
What happens if two private yards, which have merged with each other via an "Eruv Chatzeirot", extend into the enclosed space: Eruvin 20a
What happens if the well dries up on Shabbat: Eruvin 20a
What happens if a dry well brings forth water anew on Shabbat: Eruvin 20a
The Walls
What if the public passes through the area between the walls: Eruvin 20a, 22a
How to enclose the well: Eruvin 17b-18a
The name, "Deyumdin," for the special types of walls used in this type of enclosure: Eruvin 18a
The proportion of corner enclosures to wall segments: Eruvin 19b
How high the enclosure should be: Eruvin 17b
The maximum permissible open-space width between the boundary markers [Pasim]: Eruvin 10a, 11a, 17b, 19a-b, 22a
Considering a gradual rise in the ground [Teil haMitlaket] as a valid enclosure for a well: Eruvin 19b
Considering a stone to be hollowed out, such that it becomes like a corner enclosure for a well: Eruvin 19b
Considering a tree or wall as an enclosure: Eruvin 15a
When are "Peshutin," straight pieces of wall, needed in the space between the corner-walls: Eruvin 19b
Waiving the principle [Parutz Merubeh Al haOmeid] that a gap which is larger than its surrounding walls cancels out the walls themselves: Eruvin 10a, 11a
Using a natural growth as a wall: Eruvin 15a
Counting a growth of reeds which form a corner, as one of the corner enclosures [Deyumdin]: Eruvin 15a, 16b, 19b
Miscellania
Absence of these well-enclosures outside Israel, because of the lack of Torah study centers to which people could travel: Eruvin 21a
Absence of these well-enclosures in Babylon, since there was plenty of water available there, and so this leniency was unncessary: Eruvin 21a
