EG Map
From ALttP Speedrunning Wiki
The EG Map, sometimes also called the Underworld map, is a map displaying the true arrangement of all the game's indoor rooms. In normal gameplay, the game hides the fact that all the rooms are on the same map. However, through using glitches, the organization and mechanics of the overall map become important to understand.
Contents
Fully Annotated Map
A fully annotated version of the EG Map can be found here: File:EG map fully annotated.png
This map has a wealth of information regarding the mechanics of the EG Map.