By its internal border with the outer edge of the adductor longus.

The crisis threatened to develop into military confrontation as both sides mobilized their forces at the internal border.

Internal borders are subject to minimal or non-existent controls and usually allow citizens to travel without having to show passports.

Most internal borders were kept unchanged from the colonial period, generally following natural features such as rivers and mountain ridges.

This tribal-based theory suggested that external borders were weak or non-existent and that there were clear-cut internal borders.