The world of Elex includes four big cities and the Origin village (refer to the map above). Entering different locations isn’t always safe; you can check which locations to be careful with just below:
Goliet is (probably) the first bigger location that you will visit. This place is the Berserkers' headquarters and is located in Edan. Its citizens are friendly which means that you won't have any problems with entering the city.
Domed City is a place, where you can find Clerics (but it is not their main headquarters). Entering the city can be a bit problematic because you need to have an ID card. You can get it for completing a certain quest (more about that can be found in FAQ section – How to enter Domed City?)
The Fort is the Outlaws' main headquarter and is located on Tavar desert. A guard will stop you near a gate (this won't happen once because a guard stops you when you go back to the city). He wants you to pay him. You can give him Elexit, use charisma or fight with him – the last option should only be selected when your character becomes strong enough.
The Hort is the Clerics' stronghold that is built on Ignadon's volcanic land. A guard, called Xandor, will stop you near the entrance. However, you can simply bribe him – Xandor won't accept it but he proposes a quest that will help you enter inside.
Origin village is a place where ex-members of various factions come together. They are people that are against factions' ideologies and believes. Everyone that is willing to work is welcomed in the village.