Cat Ba Island is the largest island in Cat Ba Archipelago, located in Ha Long Bay, Vietnam. It is known for its stunning natural beauty, featuring lush forests, rugged cliffs, and sandy beaches. The island is part of Cat Ba National Park, which is home to diverse wildlife and offers various outdoor activities like hiking and kayaking. The main town on the island, Cat Ba Town, serves as a hub for visitors, providing accommodations, restaurants, and shops. Tourists often explore the nearby Lan Ha Bay, which is famous for its tranquil waters and unique limestone formations, making it a popular destination for boat tours and water sports.