Its hard to tell by the picture but it looks like Malaysian to me. Its looks like the "Malaysian Driftwood" They sell at my LFS at least. From what I have read, as long as you avoid soft wood (such as pine and cedar) and the wood is not rotting you should be fine. It is also recomended to soak your wood before putting in the tank to leach tannins out and to get it to sink. Also if you are unsure of its origins, boiling it will kill any critters that may be in it.