Words to Describe unnavigable

Things unnavigable often describes ("unnavigable ________")

• torrents
• water
• course
• tract
• tributary
• ice
• channels
• estero
• streams
• river
• portions
• ocean
• channel
• waters
• zambesi
• way
• portion
• sections
• section
• oceans
• song
• rapids
• watercourses
• condition
• parts
• rivers
• seas
• waterways
• reaches
• headwaters
• torrent
• character
• sea
• lake
• owing
• stream
• stretch
• stretches
• subject
• space