Is There a River in the Dharma?

The Buddha used the image of a river flowing to the ocean, and you could think of that as the stream leading to Nibbana. That's when we are in the flow of impermanence. And then he used the example if the current of the water hits an obstacle, like a rock or something,. So what will happen as it goes over the Rock? It creates a little vortex; sometimes in eddy where the current goes in the opposite direction to the main flow. He used this example of the vortex and the eddy at those times in the flow When we get caught by something creating the sense of self,  and we're no longer in the flow, then we