2-The bridge is too long.In order to construct it a low sea level is needed.
Maybe the bridge was a remodelation of an ancient bridge (somekind of Roman aquedut).TREE-LINED ROAD.
This bridge will be distorted by eathquakes somewhere on the future.Believe-me,Ican predict the future of that bridge(I am not a fortune teller nor I am kidding)
3-She plans to generate that artificial thing I am talking about .This isnīt about the red area you are showing.Last time there was an error and I was unable to see the map.And I am not able to see the pictures you post now.
The isolated regions you mention were semi-flooded regions.
DSRC area and FH area were flooded regions.
4-Look,you canīt go from Galbadia to Winhill on foot.You can go from Dollet and Timber to Galbadia on foot,though.
5-If you guess what is the nature of this lines you will understand why canīt they be crossed by foot.You will understand also why is there a separate region south of Esthar.Also there is a separate region because the polygon dictates it.
6-I think the DSRC area was an area whichwasnīt supposed to be found.
Thatīs why they didnīt include it on the symbol.But this secret area can be found turning the symbol into a sphere.Itīs the hole that is left.
Conclusion-You think this isnīt artificial because it divides regions which were related someway (culture,weather,soil color,name,etc...).
Well,people around the world will never realise this due to the same reason.And this was Xīs real intention.
Remember,the lines were supposed to cross UC regions.And thatīs it.There were just a few exceptions but I know the lines pass there due to the nature of the lines.