Huai O is a subdistrict of Amphoe Long.
No boundary for Huai O yet
Nothing has been written about Huai O here, and neither Wikipedia nor Wikivoyage has an article we could draw one from. If you know the place, that makes you a better source than anything we have. Tell us what is worth knowing and where you got it.
We show Long as the capital of Huai O. If that is wrong, tell us what it should be and where you read it.
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