Catatumbo, Colombia – The Catatumbo region, which stretches along the border with Venezuela in the department of Norte de Santander, is Colombia’s most volatile frontier.

Endowed with oil reserves and coca crops but impoverished and neglected, this border area has historically been a site of violent competition between armed groups fighting for territorial control.

The National Liberation Army (ELN) , Colombia’s largest remaining guerrilla force, maintains a strong and organised presence, operating across the porous border with Venezuela.

It is there that some of their fighters pick up an Al Jazeera reporting team and drive us to meet their commanders.

Tensions remain high in this region. In January, thousands of people were displaced because of the fighting between the ELN and a di

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