This is more of a strict list. There is at least one that is for movies that take place in a single location (e.g. a cabin, a hotel, etc.), but for one thing, that means scenes can take place in different rooms etc. And for another, that particular list includes some that have other locations...for example Titanic has scenes that take place in a house, and on the exploration ship...and for that matter the rest of the movie is simply a flashback story (which also takes place in locations other than the Titanic..the Carpathia and the loading dock). So that one is pretty loose in it's restrictions.
This list is films that take place in entirely one area. Not any of the story told in the film (not even a flashback) takes place anywhere else. This tends to make for interesting films...as the storytelling has to be incredibly compelling for it to work.