If you're stuck, read below.
If you're just asking out of curiosity (i.e. before the game wants you to go there), you might want to skip that trip until you the in-game stuff tells you to go.
- [+] SPOILER
- Captain Dorse will take you to the Ashen Wastes after you complete the Shards of Fate quest and trigger The Ark of Lothasan Quest.
http://www.exiledkingdoms.com/wiki/inde ... f_Lothasan
If you have The Ark of Lothasan quest active and Captain Dorse won't offer to take you, try staying at an inn to respawn the map.