The Pinacanauan River, seen just below the Callao Caves, is one of the major tributaries of the Cagayan River.
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/20119750@N00">Shubert Ciencia</a>
CC BY 2.0
originally posted to <b><a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a></b> as <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/20119750@N00/563125091">Pinacanauan River (Penablanca, Cagayan)</a>