Where on Earth will the compass point with the blue end to the south and the red end to the north?

The blue compass arrow points not to the geographic North Pole, but to the magnetic pole. If you are between these points, then the blue compass arrow points to the south. The earth’s magnetic poles are not in a constant place, but gradually “move”. To give an accurate answer to this question, you need to know the geographical coordinates of the north magnetic pole at the moment.
Answer: on the segment between the north geographic and magnetic poles.