Looking at the map, it shows (1) that the countries with a population of over 1 billion in the world are China and India;

(2) Asia is the continent with the largest number of countries with a population of more than 1 billion; Except Antarctica, no continent has a population of more than 1 100 million, and that is Oceania.

(3) According to the chart, the name of the country across Europe and Asia is Russia;

Countries whose territories are all located in the Western Hemisphere have ① ② ③; The country code of all the territories in the tropics (23.5° N-23.5° S in the tropics) is ④ (1 1).

So the answer is: (1) China; India; (2) Asia; Oceania; (3) Russia; ①②③; ④( 1 1).