To access this map you will have to go to the library, completing "Examine the Mechanism and Open the Great Door Puzzle", part of the world "The Subterranean Trials of Drake and Serpent"> in the library you can unlock the Enkanomiya map by interacting with him map that appears on the wall behind NPC Enjou, after talking to him.
But to get the complete map you will have to complete the world missions "From dusk to dawn in Byakuyakoku" and activate the mission "The three great martial trials", which will unlock three new islands and complete the map. For this you will have to interact with Eboshi in The Serpent's Heart.
That's all you need to know about how to get the full Enkanomiya map in Genshin Impact, so now that we've reached the end, we hope you can quickly get hold of the stop for this new area.