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The allocation IDs of the Elastic IP addresses (EIPs) to be used for handling outbound NAT traffic in this specific Availability Zone.

For regional NAT gateways only: The Availability Zone where this specific NAT gateway configuration will be active. Each AZ in a regional NAT gateway has its own configuration to handle outbound NAT traffic from that AZ.

For regional NAT gateways only: The ID of the Availability Zone where this specific NAT gateway configuration will be active. Each AZ in a regional NAT gateway has its own configuration to handle outbound NAT traffic from that AZ. Use this instead of AvailabilityZone for consistent identification of AZs across Amazon Web Services Regions.