Publicly and privately controlled systems and assets, including the built and natural environments and human resources, essential to the sustained functioning of the Portland/Vancouver metropolitan area including the counties of Clackamas, Columbia, Multnomah and Washington in Oregon and Clark County in Washington. Such systems and specifically include those necessary to ensure continuity of security, safety, health and sanitation services, support the area's economy and/or maintain public confidence. Incapacitation or destructions of any of these systems or assets would have a debilitating impact on the area either directly, through interdependencies and/or through cascading effects