Before Phu Quoc became a popular ecotourism destination, it was a quiet island with about 45,000 people. (1) _______ has grown to nearly 180,000 in a few decades, and tourism has flourished. (2) _______, more than half of the island and its surrounding waters remain full of natural beauty.

This success is thanks to the UNESCO Kien Giang Biosphere Reserve, (3) _______ protects the land, water, and resources while supporting sustainable development. The reserve includes 105 islands, with Phu Quoc being the largest, and is home to many plant and animal species, including (4) _______ species. The surrounding ocean is (5) _______, allowing fishing to continue without harming the ecosystem, and marine life, mainly squid and anchovies, is essential to the local community.

1. On January 1, 1502, a Portuguese explorer named Goncalo Coelho and his crew arrived at a large bay in Brazil. They thought they had found the mouth of a big river, so they called the place "Rio de Janeiro," which means "River of January." This bay is now known as the Harbor of Rio de Janeiro.

2. The Harbor of Rio de Janeiro is the largest natural bay in the world, with more water than any other bay. Because of its size and beauty, it is considered one of the world's seven natural wonders. The bay is surrounded by tall, steep mountains made of granite.

3. These mountains have distinctive shapes. One is called Sugarloaf because it looks like a kind of bread made in Portugal. Another is named Corcovado, or "The Hunchback," because of its shape. The combination of the mountains and the water creates a stunning view. Today, many tourists visit the harbor, and there are cable cars and trains to help them explore the area.