Co To is an archipelago of about 50 islands located in the east of Quang Ninh province with an area of ​​46.2 km². Co To island district currently has 1,500 households, with nearly 6,000 people. Co To archipelago has more than 50 islands, large and small rocks, of which Co To large and Co To are two islands possessing the most beautiful beaches. This is also a place with great potential for tourism development.