Rugged, craggy and jungle-clad Cat Ba, the largest island in Halong Bay, has experienced a tourism surge in recent years. The central hub of Cat Ba Town is now framed by a chain of low-rise concrete hotels along its once-lovely bay, but the rest of the island is largely untouched and as wild as ever. With idyllic Lan Ha Bay just offshore, you'll soon overlook Cat Ba Town's overdevelopment.
Almost half of Cat Ba Island (with a total area of 354 sq km) and 90 sq km of the adjacent waters were declared a national park in 1986 to protect the island’s diverse ecosystems. Most of the coastline consists of rocky cliffs, but there are some sandy beaches and tiny fishing villages hidden away in small coves.
Lakes, waterfalls and grottoes dot the spectacular limestone hills, the highest rising 331m above sea level. The island’s largest body of water is Ech Lake (3 hectares).