Heartland is a geopolitical theory associated with Halford Mackinder, who argued that control of a central strategic zone could shape power across a wider region. In the original model, the “heartland” is not just a place on a map; it is the core area whose resources, position, or access routes can influence surrounding territory.
In cyber security, Heartland is used as a metaphor for chokepoints and highly concentrated dependencies. It helps defenders ask which shared services, identity platforms, cloud providers, telecom backbones, or industrial control layers are so central that their failure would affect many others. Attackers often target these bottlenecks because disrupting one critical layer can create broad operational impact. Defenders use the same idea to improve dependency mapping, resilience planning, and recovery testing. The key lesson is practical: security is not only about protecting individual systems, but also about understanding where leverage and fragility are concentrated.