Explore details about location 国道４２号. 国道４２号 is a location situated within the 海南市 alongside other areas such as 岩出海南線, 海南金屋線, 阪和自動車道. Additionally, some smaller parts of 国道４２号 include specific areas like 和歌山海南線, 岩出海南線 adding to the diversity of its landscape.