Antipodes (plural noun)
Diametrically opposite. Or if you’re in the Northern Hemisphere, Australia and it’s surrounding nations.
Late Middle English: via French or late Latin from Greek antipodes ‘having the feet opposite’, from anti ‘against, opposite’ + pous, pod- ‘foot’. The term originally denoted the inhabitants of opposite sides of the earth.
“Well they’re the antipodes of what we were looking for to be honest.”
“I fly on Friday from Heathrow, London for a tour of the Antipodes.”