Where is the glowing green cave in Dravaninan Hinterlands?

[Rongway]

It sounds like in your excitement you mixed up two different bits.


The place they visited with the green crystals was this hole here around (10.5, 35.1):




The statue of Thaliak is in the EW full trailer. It came up because the tour group flew over the Thaliak River, of which Oda-san had this to say:

So this is for Thaliak, the Ruler of Rivers and Wisdom and God of Knowledge, which is the patron deity of Sharlayan. As you probably know, all of the city states of Eorzea have their own patron deity, such as Llymlaen, Watcher of the Seas and Goddess of Navigation, for Limsa Lominsa, and Nald'thal, Overseer of the Underworld and God of Commerce for Ul'dah. In the trailer, actually, when you see Old Sharlayan, there is a statue of Thaliak that you can see. So, if you have listened to this you should go back and find it.

The statue is quite prominent. You won't miss it if you watch the trailer.