This mod introduces real flowing rivers, with a true current, to Minecraft. These rivers are generated in the world using custom non-decaying flowing blocks and are much larger than anything the player could create using buckets. They originate in multiple sources and flow down the terrain through slopes and waterfalls, joining together into wider rivers until they reach the sea.
Note: This mod requires the Farseek API, available here.
See the the mod's forum thread here.