7El Nido, Philippines

El Nido, located on the island of Palawan, is famous for its limestone cliffs and clear turquoise waters.

It’s one of the most picturesque beach destinations in the world. However, overtourism has become a significant problem here. The once-pristine waters have suffered from pollution, and the coral reefs are dying due to frequent boat traffic and careless tourists. While the Philippine government is trying to regulate the number of visitors, the damage has already been done.