Italy: lowest point: Mediterranean Sea 0 m
highest point: Mont Blanc (Monte Bianco) 4,807 m
Jamaica: lowest point: Caribbean Sea 0 m
highest point: Blue Mountain Peak 2,256 m
Jan Mayen: lowest point: Norwegian Sea 0 m
highest point: Haakon VII Toppen/Beerenberg 2,277 m
Japan: lowest point: Hachiro-gata -4 m
highest point: Fujiyama 3,776 m
Jarvis Island: lowest point: Pacific Ocean 0 m
highest point: unnamed location 7 m