Some include unbridged rivers that must be forded. It exists in three isomeric forms&colon; "cis", "trans", and an unbridged, open form. He was stopped by the river Halys, then unbridged. There are two (and sometimes three) unbridged stream fords. The lower Shashe River forms the border between Botswana and Zimbabwe and is unbridged. Finally the trail has many unbridged stream crossings, especially on the County Line Branch stream.