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Cat Ba Island Guide — Beaches, Treks, Caves & Cruises from Halong Bay — Updated

Cat Ba Island is Vietnam’s largest island and a UNESCO Biosphere Reserve located in the heart of Halong Bay’s karst landscape. While most travelers focus on bay cruises, Cat Ba itself offers incredible trekking, pristine beaches — as this Cat Ba Island guide details, fascinating war history, and unique wildlife — including the critically endangered Cat Ba langur.. This Cat Ba Island guide covers everything you need

Cat Ba Island Guide — Top Attractions

Top Attractions on Cat Ba Island

1. Cat Ba National Park

Covering over half the island, the national park features tropical forests, limestone peaks, and diverse wildlife. Cat Ba Island Halong Bay is Vietnam’s largest island. Popular treks range from 1-4 hours through jungle trails with panoramic viewpoints. The park is home to 32 mammal species, 69 bird species, and over 700 plant species.

2. Hospital Cave (Hang Quân Y)

A remarkable three-story cave complex used as a secret hospital and military base during the American War (1963-1975). The cave could shelter 200 people and included operating rooms, a cinema, and a swimming pool. A fascinating piece of Vietnamese history.

Cat Ba Island Halong Bay — Top Attractions

3. Cannon Fort (Pháo Đài Thần Công)

Built during the Japanese occupation, this fort sits at one of Cat Ba’s highest points with panoramic 360-degree views of both Halong Bay and Lan Ha Bay. The climb is steep but the views are extraordinary — arguably the best on the island.

4. Cat Co Beaches

Three small but beautiful beaches (Cat Co 1, 2, and 3) on the island’s eastern shore. Cat Co 1 is the most developed with sunbeds and restaurants. Cat Co 3 is the most secluded and picturesque, connected to Cat Co 2 by a cliff-side walkway.

5. Lan Ha Bay

The waters directly south of Cat Ba Island form Lan Ha Bay — quieter and arguably more beautiful than Halong Bay. Our Tropical Cruise explores the best of Lan Ha Bay, while our Cat Ba Island Day Cruise combines island time with bay cruising.

How to Visit Cat Ba Island

Option From Duration Price
Cat Ba Day Cruise Halong Bay Full day Contact us
Ferry from Haiphong Haiphong 45 min ~$8
Speedboat from Tuan Chau Halong City 30 min ~$10

Easiest option: Our Cat Ba Island Day Cruise from Halong Bay includes transfer from Hanoi, bay cruising, island exploration, and lunch — all in one package.

visiting Cat Ba Island Halong Bay on a day cruise.

Best Time to Visit Cat Ba

April-October: Warm weather perfect for beaches, swimming, and trekking. The island is lush and green.

November-March: Cooler temperatures ideal for trekking the National Park. Fewer tourists but some beach facilities may close.

Combining Cat Ba with Halong Bay

We recommend spending at least 2 days in the area to experience both:

Or for the ultimate experience: overnight cruise + Cat Ba day trip.

Quick Tips for First-Time Visitors

This Cat Ba Island guide would not be complete without a few practical pointers for first-time travelers. The best months to visit Cat Ba are from September through November, when humidity drops and the karst scenery turns a vivid emerald green. Most guesthouses and homestays are concentrated along the harbor road, offering easy access to ferry terminals, seafood restaurants, and motorbike rental shops. If you plan to combine Cat Ba with a Halong Bay cruise, consider booking a day cruise that includes a Cat Ba Island stopover — it saves transit time and lets you experience both destinations in a single itinerary. Cash is still king on the island; ATMs exist near the main square but can run dry on weekends, so withdraw enough before crossing from the mainland.

© 2026 Cozy Vietnam Travel.

Cat Ba Island Halong Bay offers pristine beaches.

Related Reading

Planning Your Cat Ba Trip

The best way to experience Cat Ba Island is as part of a Lan Ha Bay day cruise. The Tropical Cruise handles all logistics: pickup from Hanoi, expressway transfer, and a curated itinerary covering the island’s top attractions — all for $58-72/person including lunch and activities.

Cat Ba is increasingly popular with adventure travelers seeking alternatives to crowded Halong Bay. The island’s Cat Ba National Park covers 263 km² of protected jungle, home to over 1,500 plant species and the critically endangered Cat Ba Langur — fewer than 70 remain in the wild.

For those comparing options, our Halong Bay vs Lan Ha Bay guide breaks down the key differences to help you decide.

Planning Your Cat Ba Trip

The best way to experience Cat Ba Island is the Tropical Cruise day trip: Hanoi pickup, expressway transfer, and a curated itinerary covering the island’s top attractions — all for $58-72/person.

Cat Ba’s National Park covers 263 km² of protected jungle, home to over 1,500 plant species and the critically endangered Cat Ba Langur — fewer than 70 remain. For comparing options, our Halong vs Lan Ha guide breaks down key differences.

For travelers with more time, combine Cat Ba Island with an overnight stay on Cozy Bay Grand — experience both Halong Bay and Lan Ha Bay in a single unforgettable trip. Follow this Cat Ba Island guide for the best experience starting from $139/person.