In case you don't know, the official English location names are displayed when we enter each area for the first time. I could check them because I basically didn't overwrite the save data, but unfortunately I just sold my copy
(to the game's credit, it was actually an excellent game but I needed money) so I check niconico.
ビルジ湖 is Lake Bilge.
ガプラ樹林 is The Gapra Whitewood.
アルカキルティ大平原 is The Archylte Steppe.
Hanged Edge, Vile Peaks and Sunleth Waterscape are correct, give or take 'The'. I'll seek for the English equivalents of ヤシャス山, スーリヤ湖 and テージンタワー later. Also, please don't forget to update the Limited Edition entry
