Turtles All the Way Down

While fishing for Highland Guppy in Twilight Highlands tonight I caught a Sea Turtle. That earned me the achievement Turtles All the Way Down and got me a mount that pretty much crawls along on land but moves along pretty well in the water. It is funny too because I was just thinking about it about a half hour before I caught it. I was wondering if you could catch them in the new areas or still only in Northrend. As Twilight Highlands is in Azeroth I guess the answer is Northrend and the new are

World of Warkraft...