Explanation

The equator passes through 13 countries:

1.      Ecuador,

2.      Colombia,

3.      Brazil,

4.      Sao Tome & Principe,

5.      Gabon,

6.      Republic of the Congo,

7.      Democratic Republic of the Congo,

8.      Uganda,

9.      Kenya,

10.  Somalia,

11.  Maldives,

12.               Indonesia

13.               Kiribati.