Board Thread:Spoilers/@comment-25440448-20150312215244/@comment-24670104-20150730140253

If there is a River Clan then they would be the Water Grounders (when Jason Rothenberg said there are Water Grounders, Ice Grounders, Boat Grounders, and Mountain Grounders (The Ice Grounders are the Ice Nation, Boat Grounders are the Boat People, Mountain Grounders are the Woods Clan(living in the Blue Ridge Mountains) and now we know the Water Grounders are the River Clan)) and the River Clan may be the owner of the flag on picture 14 of the gallery on the Grounders wiki page.