Sukritact's Fuji and Krakatoa from Terra Mirabilis will NOT appear by default due to compatibility issues between volcanoes and the 2 natural wonders (I did what I can to try and get it to show up but no avail. Go pester the authors of those mods for a fix). Until then, performing the following will enable both volcanoes to appear on the map:

1) Go to the file containing the mod. The default location will be C:\Program Files (x86)\Steam\steamapps\workshop\content\289070\2907173761

2) Go inside Map folder and open ExtraPlacement.xml using a text editor like Notepad++ or Visual Studio Code

3) There will be a instruction inside the file to enable each volcano which requires you to comment out or delete a line.(Disabling the volcanoes without using the proper mods will cause the game to spawn a normal mountain instead of a unnamed volcano)