# File lib/ec2/ec2.rb, line 1118
    def describe_regions(list=[])
      link = generate_request("DescribeRegions",
                              hash_params('RegionName', list.to_a))
      request_cache_or_info :describe_regions, link, QEc2DescribeRegionsParser, @@bench, list.nil? || list.empty?
    rescue Exception
      on_exception
    end