Wikipedia defines autonomous regions as:
An autonomous area is an area of a country that has a degree of autonomy, or freedom from an external authority. Typically it is either geographically distinct from the country or is populated by a national minority.
Seeds of ideology sympathetic to terrorists seem to grow in autonomous regions wherein the population are poor and are at generally at odds with its central government. Here are some countries wherein it is having problems with terrorism within its designated autonomous zones.
Pakistan: Federally Administered Tribal Areas
China: Xinjiang Uygur autonomous region
Philippines: Autonomous Region in Muslim Mindanao (ARMM)
Spain: Basque Country
Tajikistan’s Gorno-Bakhashan autonomous region