a confluence is a natural or crafted intersection and joining of rivers or streams. Unlike a delta where they end into a larger body of water they continue toward a delta but get larger as they come together. Usually they will loose the name of the lessor significant tributary and just become the larger river. 

Here I counted like 5 streams becoming one at one point.  Very interesting to see so many in one spot.  That means you should be prepared to get wet feet as you will have to cross several of them to get the cache.   

This is not accessible from the highway. You will have to take the long way around to get to the parking area.  I leave this details to you as it is part of the challenge here.