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 海南金屋線, 海南吉備線, 国道４２４号. Additionally, some smaller parts of 国道４２号 include specific areas like 和歌山海南線, 興加茂郷停車場線 adding to the diversity of its landscape.