About 80 thousand people.

Arecibo is a coastal city on the north shore and was long famous for one of the largest radio telescopes in the world. It is a place of ocean and science.
You can learn about space at the giant telescope site, splash in wavy beaches, and explore the amazing Camuy River caves nearby.
For many years the huge Arecibo dish listened to signals from far across space and helped scientists study stars and planets.
A colorful pirate-themed lighthouse park and the deep Camuy caves make Arecibo a fun place for young explorers.