In 2007, I visited the town of Lencois and took some amazing shots. I loved the place and this place in particular, the Pratinha River. The crystal clear river flows under the rocks to the other side (See the other side of the river here.) At around 2:30pm, the sun shines directly on the water of the river, through the narrow gap between the rocks and the river glows blue. It is amazing but lasts too briefly!