Week 1, Earth
Her magic slowly spread out 1 mile to the west, 3 to the east, 11 to the north, and 3 to the south. That was 56 square miles in total. It drained at her magic to reach so far out but fortunately once done the magic of the Earth connected and recognized her claim being made and took over. It pulsed at her feeling her want, surprising her. The earth had never been this responsive to her before and she had to wonder if it was because of how she had died in her last life or simply that this world had never had anyone commune with it before.
She pushed back and showed her limited knowledge of this universe's future and how little would survive, at least to her knowledge. The Earth pulsed at her frantic and almost violently in it's questioning of why she would not stop it and she gave her reasoning. The fact was as much as she didn't want to lose the Earth and would do her best to keep this little haven safe there wasn't anything else she could do. If they weren't already then the reactor plants would be burning soon enough and bring about the end of most of this world leaving little to nothing untouched by its radiation wave and the planet uninhabitable for humans.
But then it asked something she had not even considered. Could its magic stop them? Could Earth use its own energy to shield itself from the effects? The answer was that she just didn't know. It made sense though that if a shield could be made to block the effects then why not one to keep it locked in it's own location ensuring it could only leave a small portion uninhabitable.
I can teach you, show you the way. She sent to the Earth and felt its agreement to learn.
The outermost layer of the wards would be a barrier and a combination of various shields, more and larger than she knew she would have ever been able to create herself. An adaption barrier with the combination of an assimilation shield, healing shield, and radiation shield. In truth, she had known that it was likely she could only form the barrier around the entire boundary. It was after all only her powering the formation and a lot of ground to cover so she had planned on slowly creating the shields further in over time, likely using the walls themselves as their base. She knew the longer the wards were settled the stronger they became but despite her massive core it still wasn't enough to do so at the strength needed unless she killed herself and she doubted there would be another rebirth just waiting for her if she did. Fortunately, the Earth in turn for her teaching and guiding it in the wards' creation would power their formation itself.
The adaption barrier would ensure that the wards wouldn't simply collapse the moment it was struck by an attack, this would help not only with Praimfaya but if the 'mountain men' ever tried to launch an attack on the valley. The assimilation and radiation shield were interwoven and would or rather should not only absorb the radiation wave into itself stopping it from entering the valley but also use it to make the wards stronger. The healing shield would allow the shield to fix not only the wards but that which it slightly touched outside it and even more so inward.
The wards were being not only powered but infused by the Earth's energy. She used her magic to guide the Earth in what had to be done. She kept the energy small within her almost holding its hand as they built the mesh so that it would seamlessly grow as it expanded outward. The crisscross pattern expanding up and outwards until it formed an open dome that would only be completed once it reached the end of its reach, her claimed territory. Once ready and the earth confirmed that it could replicate it she pushed it outwards. The earth leading it, visible to the human eye until it reached and settled at her territory's borders.
Remember, you have to build it aimed inwards. She sent to the Earth and felt its agreement. The Earth told her how the wards had taken much of its energy as it had been weakened by the last attack upon it and ensuring its survival. It would take time to build and strengthen the many wards needed but it promised it would start on this land mass and those that were closest first.
~~Below are the promised~~
~~Maps and Explanation of my Doubts on them (for USA; not state versions) available~~
Ok, I promised some maps, for those of you on Fanfiction as usual I'm sorry! The website doesn't allow pics, gifs, or video but you can find it on this same chapter on Wattpad or Ao3. I'll try to describe the territory lines though or at least the general position of the clans based on the map created to show it. Again, the canon maps showing the entire USA were clearly way off and I'll give the reasons why. (Sorry again, Fanfiction viewers!)
The map above somewhat illustrates what I imagine the territories would have been before the formation of the Coalition. As many of you can see there are major gaps and unclaimed portions throughout. I imagine that Mt. Weather was actually left as one of these gaps. A thing to remember though is that the west coast remained unknown to us and it is for that reason it remains completely unclaimed. Even among the grounders we hear of nothing further out that way. With this, there's many theories one even going to California itself having sunk or broken off, even becoming a dead-zone. Either way we know some type of significant change has occurred.
Recently while rewatching the 100 I noticed something that I didn't before. Every single time one of them looks out to the earth from the Ark there is mostly ocean. In S1E7 when Abby becomes aware of the hurricane over the 100, we see what would be the 'new' North America and upper part of South America. In this it becomes clear that the Gulf of Mexico has in fact increased in size, reaching further into the states. I say this because through the clouds of the hurricane we can see blue (ocean) instead of what should be land mass. Another thing proving this is that the only lakes visible from space would be the great lakes and yet we can see the lower portion of one of them (possibly Lake Michigan or Lake Erie) at the top of the screen but limited land mass between the lake and the outer cloud formation of the hurricane.
This massive change in not only the terrain but shape and size of the USA would explain how a Hurricane in the middle of the Gulf could be 'right on top of them' and also explains my belief in the maps we have of the 100 borders being wrong.
Next will basically be what we know of the 100 territories after the Coalition. Those of you who can see this map will notice a clear difference in the locations of clans which is yet another proof that we don't know exactly where they are. Regardless this is just to show that it is after the Coalition that formal lines will be drawn. Also please ignore the pin locations for Skaikru and Trikru on this as they are wrong. One fact we do know from both maps are that the Ice Nation is north-west to the Wood Clan and Shallow Valley is to the south-west. The Wood Clan also hold most BUT not all of Virginia.
Now, Shallow Valley as mentioned before had to be a lot closer than any of the maps show as there is no way Clarke would survive traveling from to either of the Carolinas let alone Georgia on foot without food or more importantly water (based on the maps). Polis was located in what was once Baltimore (Clarke waited out Praimfaya in NJ though so she was even further away but let me by nice because google won't give me those calculations) so if we look at her traveling from Polis and by the maps we estimate that Shallow Valley was in Charlotte, NC Clarke would have to travel about 420.5 miles, roughly 5-6 days, as she didn't have a vehicle in the early days after Praimfaya. The human body can usually only survive 4 days without water, being extremely generous 7 should she drink her own fluids (ew), but that is still coming from Polis and at modern day convenience with roads and maps and not having to search for something to eat. So it would actually take longer and again she was actually on Becca's Island which was located somewhere off the Jersey coast and south of Long Island.
^^ Therefore, the 100 map of the northeast coast I have edited and comes into play. For those of you who cannot see it I have made it so Sky Valley is located 60 miles south-west of where the dropship landed, known as Fort Valley, VA today. Shallow Valley will be another 40 miles south (and slightly west) of Sky Valley in Shenandoah Valley, VA. I know it's not a creative name but I'm tired and I have the flu. If you guys want to give me some ideas of what they should name their home I'm open to suggestions and honestly the grounders weren't creative with what they were called either. For example Wood Clan, Lake People, Plain Riders; none are really creative so I don't see why they would be different.