Explore details about location 本渡下田線. 本渡下田線 is a location situated within the 天草市 alongside other areas such as 牛深天草線, 坂瀬川御領線, 国道２６６号. Additionally, some smaller parts of 本渡下田線 include specific areas like 本渡苓北線, 国道３２４号 adding to the diversity of its landscape.