flowchart TB
    subgraph Region
        subgraph VPC ["VPC (10.0.0.0/16)"]

            IGW((("Internet Gateway")))

            Router[("Router")]

            IGW <--> Router

            subgraph Subnet1 ["Subnet"]
                SG1["Security Group"]
                EC2_1A(["EC2"])
                EC2_1B(["EC2"])
                SG1 <--> EC2_1A
                SG1 <--> EC2_1B
            end

            subgraph Subnet2 ["Subnet"]
                SG2["Security Group"]
                EC2_2A(["EC2"])
                EC2_2B(["EC2"])
                SG2 <--> EC2_2A
                SG2 <--> EC2_2B
            end

            RouteTable1["Route Table"]
            RouteTable2["Route Table"]

            ACL1[("Network ACL")]
            ACL2[("Network ACL")]

            Router <--> RouteTable1 <--> ACL1 <--> Subnet1
            Router <--> RouteTable2 <--> ACL2 <--> Subnet2
        end
    end