I am new to TF and I am trying to have a variable which will include all the regions for different S3 buckets.

variable.tf

 variable "s3_bucket_arn" {
  type = any
   default = {
    us-east-1 = "arn:aws:s3:::centralized-vpcflowlogs-logging-us"
    us-east-2 = "arn:aws:s3:::centralized-vpcflowlogs-logging-us"
    us-west-2 = "arn:aws:s3:::centralized-vpcflowlogs-logging-us"
    us-west-1 = "arn:aws:s3:::centralized-vpcflowlogs-logging-us"
    ap-southeast-2="arn:aws:s3:::centralized-vpcflowlogs-logging-aus"
  }
}

below is VPC in main.tf

    resource "aws_flow_log" "vpc_flow_log" {
   log_destination = "${var.s3_bucket_arn}/${var.environment}/${data.aws_region.current.name}/${aws_vpc.network.id}"
    log_destination_type = "s3"
    traffic_type         = "ALL"
     vpc_id          = aws_vpc.network.id
    
}

while running the terraform plan I am getting this error.

 │ Error: Invalid template interpolation value

        log_destination = "${var.s3_bucket_arn}/${var.environment}/${data.aws_region.current.name}/${aws_vpc.network.id}"
    │     ├────────────────
    │     │ var.s3_bucket_arn is object with 5 attributes
    │ 
    │ Cannot include the given value in a string template: string required.

Any idea why I am getting the error?