Very good job!

Most 115ers from Europe are in the North-West of the Mediterranean Coast. It is normal, as people have a high quality of life there (rich areas, good and healthy diet, mild climate...). There are also some 115 y.o. people in North-Western Europe, due to the high quality of life, but there are few people older than 115 probably because of the cold weather and a worse diet.

In Japan, most of them are located in the middle and in the south of Honshu island (the main island of the country), as well as in other smaller islands of the South. I think this is because there is a better climate than in the north (Hokkaido), and probably a better quality of life and more population, but I'm not an expert of Japan.

In the USA, it's curious that there are much more 115ers in the eastern half of the country. Probably because that side of the country is more populated.

In South and Central America, most of them are located in coastal areas, where there is a milder temperature, and probably near to urban areas, with good services in infrastructures, health, education...