I think you are asking a rather vauge and undefined question as far as my view point goes. What you showed here doesn't seem to have any shape or form of an adverbial in my opinion. I am not sure what it is but it does have some resemblance of a relative clasue.
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AnonymousWhere the competition was held is really far away.These sorts of constructions form an entire series of possibilities. They are all based on interrogative expressions (who?, what?, when?, etc.)