I'll try to reply to all questions once I'm at home. Quoting people is a pain on the phone ....
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Alright, here we go!
Perhaps it would be best to set everything in stone now, then, to avoid further confusion. We should be asking:
-Where are we right now?
-How close are we to the oasis?
-How far is the oasis from the ocean?
-How long ago did the tsunami hit?
Very good questions. The way I see things is this:
1. Roughly around the starting point I indicated in the map
2. I'd say it's about a week or two of travel. That way they'd be pretty hungry and tired once they arrive. Opinions?
3. I'd imagine it lying further inland. If I were to extend the map, the ocean would bend towards the north, therefore retreating from the oasis which I imagine to be roughly east of where we start
4. I was mostly looking at Aquarius' backstory when I decided for my character that she would start the day after the tsunami, allowing the Lone Dragon to have this "rough entry" into the story with Aquarius being battered and heavily injured. I know it clinched a little with other backstories which depended a little more on the after-effects of such a catastrophy.
If you are generally unhappy with the current timing, please let me know and I will suggest changes in both the timing and the backstories of those who would no longer matchyeah, the start has been rather chaotic and the points Fyn raised are quite urgent. In the end, if no one really wants to start from the oasis at all, we may drop that idea and go on from where the major focus in our first posts are. Either way works for me.
I would be fine either way, although it'd probably be easier to keep the current situation as it is. You guys probably spent much more time writing your posts than I did (~30 mins) and it'd be sad to see the work go to waste
Please give me feedback on this so I know where everybody stands and plan accordingly 
Slash has a back story too...I'm thinking of showing occasional flashbacks of my sharptooth's life before and during the tsunami. I don't know if I'm allowed to do that though since I'm not a main character but an antagonist. Could I do that?
Yes, that sounds like a good idea to me

I believe our original starting points are on the map if we want to try Sovereigns idea. As I said before my post was probably the confusing starter because I forgot that we were supposed to start at the oasis however since the RP has gone the direction it has here is what I make of it.
Ducky is at the oasis.
Fyn is near the oasis.
Jorrdy starts close to the oasis.
I don't know where Rhombus is but that means the he could position Buko near the oasis.
And me and Sovereign have just entered the cave together which is further away from the oasis. So we could still potentially do a meet up of one group there while Aquarius and Rinen travel there. This scenario would mean that the Great Wave has only just hit unless we decide to make the previous posts as full on flashbacks while for the others not affected by the wave they would probably already be converging on the oasis. I don't know about Darkwolf though as she has posted yet.
Well, here comes the confusing part. I honoured Sovereign's idea by giving this short, direct-into-the-action, opening at the oasis. However, I did not intend to have any actual action there until we've caught up with the formation of the two groups who then reach the oasis (+ fastrunners possibly stalking), just a mere intro into the scene as well as the RP in general as it was me who made the first post. I think it is up to everybody else whether they'd like to add such a short intro to their initial posts (those who made one already anyway) and those who have not written anything yet may write one when they do. However, I'd leave that up to you really (all of this is assuming we keep the current storyline too)
Technically, one of the fastrunners may actually hang around the oasis at start if that is your wish. I would really suggest to have at least some time between the formation of the two groups and the fight at the oasis between those two groups so they'd at least develop some crude relationship however bad that might be (looks at Aquarius and Rinen) ...
Well, the big issue here is that if the wave just hit, I'll need to retract my post and wait this one out, as my character's backstory involves those who fled the disaster. I'll stand by and see what happens.
Yeah, your backstory was the one not fitting in with my initial idea

I'd really like to know if the tsunami just ended at the start of the RP or it has been about a week or less since it happened...
That's now up to discussion I guess. My assumption was it happened the day before we start :unsure:
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okay, here's everything I need your opinion on now:
keep current storyline/start at oasis/something else?
- Sovereign: either way works
- Ducky123: prefers current situation but is open to anything
when did the tsunami happen?
- Ducky123: the previous day
How far away should the oasis be from our starting locations?
- Ducky123: 1-2 weeks of travel towards the east, depending on starting point.
- Sovereign: ??? 2-3 days from Big Water
Anything else? Let me know! I hope we can clear all uncertainties asap and I apologize for creating these uncertainties in the first place!