It's completely valid to say that Portugal is the closest country to Congo, even the Portuguese West Africa Colony was established by seizing land from the Congo Kingdom.
As one goes downstream from the newly established Congo Territory of Spain, at the estuary, one can see the long-ailing Congo Kingdom and the Portuguese West Africa Colony.
Spain's ability to secretly establish territories upstream on the Congo River shocked the Portuguese, leaving them utterly perplexed.
The Portuguese were even unaware of when Spain discovered the lands upstream on the Congo River. After all, they had been operating in Congo for a long time, yet never managed to delve upstream and discover new territories.
One must understand that at this time, the colonial progress of European countries in Africa was only a negligible few percent. The only true large-scale colony was the Cape Colony established by the British in South Africa.
