Major Regions
A Major Region is a group of areas as defined by OoTMM.
Major Regions Shuffle
Major Regions Shuffle is an Entrance Randomiser option that may be seen as a milder version of the alternative Overworld Shuffle option. While Overworld Shuffle shuffles almost every overworld entrance (not including those classed as interiors or grottos) , Major Regions Shuffle groups together areas thematically and only shuffles the boundaries between those groups.
The regions listed below sets out which areas are grouped together such that the entrances between them will not be shuffled.
Example
With Major Regions Shuffle enabled, Zora's River continues to be connected to Zora's Domain but the exit towards Hyrule Field will be shuffled. The shortcut towards Lost Woods will only be shuffled if Shuffle Regional Shortcuts is also enabled (or Overworld Shuffle used instead).
Regions: Ocarina of Time
Woods
Lost Woods, Kokiri Forest and Sacred Forest Meadow.
Hyrule Field
Hyrule Field, Hyrule Market (including its alleys) and Hyrule Castle.
The join between Hyrule Field and Hyrule Market can be severed using the Shuffle Market Entrance option.
Kakariko
Kakariko Village and Kakariko Graveyard.
Death Mountain
Death Mountain Trail, Goron City and Death Mountain Crater.
Lon Lon Ranch
Only includes Lon Lon Ranch.
Lake Hylia
Only includes Lake Hylia.
The fishing pond is classed as an interior and will be shuffled only as part of interior shuffle.
Gerudo Valley
Only includes Gerudo Valley.
Gerudo Fortress
Gerudo Fortress, Haunted Wasteland and Desert Colossus.
Regions: Majora's Mask
Termina Field
Clock Town (all), Termina Field, Road to Southern Swamp, Path to Mountain Village, Road to Ikana, Ikana graveyard, Milk Road and Gormon Racetrack.
(Each spoke from Termina Field is connected as usual, but each spoke leads to a shuffled region.)
Southern Swamp
Southern Swamp, Mystery Woods and Woodfall (outside the temple).
Snowhead
Mountain Village, Twin Islands, Goron Village, Road to Snowhead, Snowhead (outside the temple).
Goron Shrine is classed as an interior and will be shuffled only as part of interior shuffle.
Great Bay
Great Bay Coast, Pinnacle Rock, Zora Bay and Zora Hall
The Beaver Race area is classed as an interior and will be shuffled only as part of interior shuffle.
Zora Hall will only be shuffled as part of Overworld Shuffle
Ikana Canyon
Ikana Canyon and Stone Tower (outside the temple).
Romani Ranch
Romani Ranch.
The Doggy Racetrack and Cucco Shack are classed as interiors and will be shuffled only as part of interior shuffle.