Well, I am working on the map right now. It is not easy to work with all of your backstories at the same time - some may not fit 100% with their starting location but I want them all to be somewhat near each other so we won't need months just to find each other

going to upload the map in a bit, it's almost finished (messy though, it'll come with some typed explanation as well because my handwriting is terrible and all over the place now

)
EDIT: doesn't look on photo at all... I think I'll try to draw it digitally... going to take a little longer!
UPDATE:

This is the map that I came up with. It looks even rougher than the traditional sketch but I had to keep a few things a bit more simple this time
Explanations:First of all, the point in time that we start is the morning after the devastating earthshake & tsunami. Tried to honour as many details of your backstories as I could but this is the best situation I think.
The land is mostly barren, some skattered rocks or dead trees/vegetation. Our first destination should be a small oasis that two groups could fight over towards the west. As for the season, I'd imagine that it is late summer with fall season right around the corner so they'll eventually get caught in the cold time

Anyway, here is what I had planned for each of you guys (no need to follow strictly, those are just my ideas

):
Me/Lizzie: starts in the dead forest, decided to stay there to seek shelter after the earthshake hit, eventually starts moving along the river
jorrdy12/Samara:barely escapes the tsunami --> terrified. Seeks refuge in the forest where she'll bump into Lizzie, them forming a loose group, walking rather slow towards the west with Lizzie
The Lone Dragon/Aquarius: Resides in a cave after receiving injuries during the earthshake and subsequent tsunami (what kind of injuries Aquarius took us up to you of course

)
Sovereign/ Rinen: starts in the barren lands. Heading north towards the site of destruction. (Maybe he could seek shelter for the night in Aquarius' cave? I'm sure they would make a troublesome pair

) Then they'll cross the river, walking westwards.
Fyn16/Orsur: starts a bit east of the rest, just enough inland to avoid the tsunami. I picture him lagging slightly behind but catching up to either of those groups. In order to have someone who is strong enough to stand up for himself in the group Lizzie and Samara are forming, I would suggest that he joins them (no idea why he would but I'd leave that to Fyn

)
--
Now for our Omnivores
(rhombus/Buko & DarkWolf91/Wyoh) 
I do not have a fix idea for either of you, only that you're a bit further away than the rest so you'd only catch up when or after the leafeaters find the oasis, where they'll meet. Whether you intermingle or not is up to you

--
the Sharpteeth
(Snik/Shade & Hypnobrai/Slash):I did not include you yet because I don't know what you are planning

Certainly, the two of you have to meet at some point. Maybe they could make their first appearance hunting either of the two groups (or one of the Ovies) while they're on their way to the oasis

*****
Before I hit that post button, let me remind you, that we planned to start the RP with the scene where they meet in the oasis, having a clash for food, as an introduction, then moving on to the events of the past (---> what I described above). If you're confused, just read my initial post for the RP which I will write right after this post.
Also, be reminded that we (more or less) agreed not to let the RP flow too slow.
The maximum time waiting for the next post should be a week, not moreAnd, again, these are just my ideas, you
do not have to follow them if you had something different planned

UPDATE:
RP has started here 