Ana Fernanda and Ana Luisa Bernal are 16-year-old twins and juniors in high school. Since kindergarten, they've crossed an international border every single day to go to school.

The girls live in Mexicali, Mexico, with their mother but, being born in the US, they're able to cross to get an education in English in Calexico, California.

Like many other transborder (or "transfronterizo" in Spanish) children studying in a different country, the twins embark on their daily journey very early in the morning.

This film is part of the BBC's Crossing Divides season.

Video journalist: Eléonore Hamelin