I had thought about that but the pattern is completely different then any I have ever seen.
Well considering it was Siam Stingrays that posted it on Facebook, I'd say pretty much for sure Thailand. Would also make it likely to be a Himantura as stated by zoodiver.
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Disk shape still doesn't match up on that one either. I had seen it on Facebook several days ago and didn't think anything of it till a friend from Thailand texted me the picture. Again he is from Thailand and is a ray guy and has no clue what species it is. Don't think it was Siam Stingrays that posted it.