What ingredients (available in specific regions) can I substitute for parsley? I have a recipe that calls for fresh parsley. I have substituted other fresh herbs for their dried equivalents but I don't have fresh or dried parsley. Is there something else (ex another dried herb) that I can use instead of parsley?

I know it is used mainly for looks rather than taste but I have a pasta recipe that calls for 2 tablespoons of parsley in the sauce and then another 2 tablespoons on top when it is done. I know the parsley on top is more for looks but there must be something about the taste otherwise it would call for parsley within the sauce as well.

I would especially like to hear about substitutes available in Southeast Asia and other parts of the world where the obvious answers (such as cilantro) are not widely available.
You might try Thai or European celery leaves as a substitute.