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MB4 210a: Disposing of Wastewater on Shabbos in a Carmelis (357:3); Status of an Enclosed Large Yard (358:1 - part 1)
Disposing wastewater in a carmelis. Pouring water from your courtyard into a pipe that empties into a חצר שאינו מעורבת.
Disposing wastewater in a walled city without an eruv.
Areas that are larger than בית סאתיים that are enclosed for purposes other than dwelling (e.g. an orchard). What about a shul or a jail?
Status of an area with natural "walls".