Nearest unblockaded core province with a port. How is this computed?

Nearest unblockaded core province with a port. How is this computed? - From above of orange usb to micro usb cable twisted into ring placed on black board

How does the game compute the nearest unblockaded core province with a port? I am playing as Ming and have cored and colonized Midway islands (picture below). However, the game still says my closest unblockaded core is in Gubbi Gubbi (Australia). How is this computed and why is Midway Islands not my closest port?

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Nearest unblockaded core province with a port. How is this computed? - Space grey type c USB hub with multiple different ports connected to laptop
Nearest unblockaded core province with a port. How is this computed? - USB type c multiport adapter with plugged white cable connected to modern laptop
Nearest unblockaded core province with a port. How is this computed? - Gray laptop with connected USB multiport station



What is a core province?

A core is a province that is considered a rightful part of a country. Cores give several strategically important benefits: Provinces without a core add to overextension (except colonies), proportional to their development value. Core provinces get a +75% positive tax modifier.



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