The Putrefied Ducts isn’t the worst or largest area in Hollow Knight: Silksong, but the map of the area can be tricky to find. You can get it fairly early in Act 2, thankfully, and having it mapped ...
The Hollow Knight: Silksong map is a dense, sprawling maze full of things that want to kill you (bugs, bigger bugs, even bigger bugs) and things that don't want to kill you but end up doing so anyway ...