Arieluma!
It's a very unpleasant swamp.
The water is pure mud and the soil has been completely ravaged... Bah!
Looking at the environment here, it really hits home what a blessed land Atreia was.
Shugos can allegedly purify water from a swamp like this; it seems doubtful that that's true though.
I'm worried about whether Templar Commander Portis recognises these difficulties in practice.