Do not confuse this word (afield) with a field (prado).
“Afield” is an adverb. A place can be “far afield (muy lejos). Contemplate these examples:
Mr. Podemos is going to live in a country far afield (…un país más lejano).
You would like to buy something and a friend advises you that “you will have to go further afield for that (…para eso hará falta buscar más lejos).
He travels as far afield as New Zealand for his work (viaja a lugares tan distantes como Nueva Zelanda …)