Act 3 or Act III: The Infernal Gate in Diablo 2, is the third Act and all its locations can be accessed by completing the The Seven Tombs quest from Act 2. The player will begin the Act in Kurast Docks which have been corrupted by Mephisto.
Locations where a waypoint can be found will be marked below with this icon: 
Act III: The Infernal Gate
Town
Surface Areas
Dungeons
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