But Islet (Pen Islet) in Lan Ha Bay: A unique limestone wonder

Explore But Islet (Pen Islet) in Lan Ha Bay, a unique limestone rock shaped like a pen. Learn its meaning, best time to visit, tours, and nearby attractions.

1. What is But Islet (Pen Islet)?

Lan Ha Bay, located next to the world-famous Ha Long Bay, is a hidden gem of northern Vietnam. With nearly 400 limestone islets rising dramatically from emerald waters, the bay offers an equally breathtaking yet less-crowded alternative to its UNESCO neighbor. Each islet has its own fascinating shape and story, turning a cruise around the bay into a journey through natural sculptures.

Among these, But Islet (also called Pen Islet) stands out as one of the most memorable sights. With its tall, slender shape resembling a pen standing upright on the sea, it sparks curiosity and wonder among travelers. Many visitors love to pause here for photos and admire how nature carved such a symbolic figure in stone.

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The panoramic beauty of But Islet in Lan Ha Bay

The islet is not large enough for exploration on foot, but its charm lies in the way it stands as a natural sculpture. Locals and tour guides often explain that the “pen” symbolizes the importance of knowledge, study, and culture in Vietnamese tradition. This adds a layer of meaning to what at first might seem just another rock among hundreds.

In the wider landscape of Lan Ha Bay, But Islet has become a natural landmark where cruise boats often slow down, giving passengers the chance to capture memorable photos.

2. Location and how to see But Islet

But Islet is located within Lan Ha Bay, which lies to the southeast of Ha Long Bay and is accessible from Cat Ba Island. The islet sits along popular cruising routes, meaning most visitors can admire it without any special detour.

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Pen Islet

There are a few easy ways to see But Islet:

Day Cruise from Cat Ba Island: Most half-day and full-day boat trips around Lan Ha Bay pass by But Islet.
Overnight Cruise in Lan Ha or Ha Long Bay: Luxury and mid-range cruises often include the islet in their itinerary.
Private Boat or Kayak Tours: While you can’t land on the islet, smaller boats allow closer views for photography.

From Cat Ba town, it usually takes about 30–40 minutes by boat to reach the main sightseeing areas of Lan Ha Bay, including But Islet. If you’re on a cruise, the captain will likely slow down so passengers can fully enjoy this natural landmark.

3. Best time to visit But Islet

Overnight cruise on Lan Ha Bay

Like the rest of Lan Ha Bay, But Islet can be visited year-round, but some seasons offer a more pleasant experience.

Spring (March–May) and Autumn (September–November) are considered the best times, with mild weather, calm waters, and clear skies.
Summer (June–August) is great for bright sunshine and vibrant photos, though occasional tropical showers may occur.
Winter (December–February) is cooler, but visibility is often excellent, making it good for photography.

For truly stunning moments, aim to see But Islet during sunrise or sunset. The soft golden light makes the limestone glow and enhances the contrast with the emerald water.

4. Things to do in But Islet

Rock climbing But Islet

Although you cannot climb or walk on But Islet, there are plenty of ways to enjoy the experience:

Take Photos: Capture the elegant shape of the “pen” from your boat deck. It’s one of the most Instagrammable spots in Lan Ha Bay.
Enjoy the View from a Kayak: If your tour includes kayaking, you may paddle near the islet for a more intimate perspective.
Relax and Admire: Sometimes the best thing to do is simply sit on the deck, sip a drink, and watch the scenery float by.
Rock Climbing (Not Recommended): Some adventurous travelers may wonder about climbing But Islet. However, the limestone islet is extremely steep and dangerous, with no safe access. For safety reasons, climbing here is strongly discouraged—enjoy its beauty from a distance instead.

5. Nearby attractions to But Islet

Turtle Islet

Turtle Islet is a limestone rock shaped like a giant turtle resting on the water. It’s one of the most photographed spots in Lan Ha Bay. The islet symbolizes peace and longevity in Vietnamese culture. Many cruises slow down here so visitors can admire and take pictures.

Ba Trai Dao Beach

Ba Trai Dao, or “Three Peaches Beach,” is famous for its white sand and crystal-clear water. The beach is surrounded by limestone cliffs, making it a quiet escape. It’s perfect for swimming, kayaking, and sunbathing. The legend of three fairy peaches adds a romantic touch to the scenery.

Rock Climbing (Not Recommended): Some adventurous travelers may wonder about climbing But Islet. However, the limestone islet is extremely steep and dangerous, with no safe access. For safety reasons, climbing here is strongly discouraged—enjoy its beauty from a distance instead.

The beauty of But Islet

Dark & Bright Caves

These twin caves offer a mix of mystery and beauty. The Bright Cave can be explored by small boat, revealing dramatic limestone formations. The Dark Cave, narrower and untouched, feels more adventurous. Kayaking here is a favorite activity for nature lovers.

Cai Beo Floating Village

Cai Beo is one of the oldest floating fishing villages in Vietnam, with history dating back thousands of years. Visitors can see traditional houses on water and watch fishermen at work. It’s a great place to experience local culture. The village also provides a peaceful contrast to the bay’s towering cliffs.

6. FAQ about But Islet

Q1: Is But Islet accessible for climbing?
The islet is too small and steep for climbing. Visitors can only admire it from boats or kayaks.

Q2: Can I visit But Islet by kayak?
Yes, some tours allow kayaking nearby. However, you cannot land directly on the islet.

Q3: Which tours in Lan Ha Bay include But Islet?
Most Lan Ha Bay day cruises and overnight cruises from Cat Ba or Ha Long include But Islet as part of their route.

Q4: How long does it take to reach from Cat Ba town?
About 30–40 minutes by boat, depending on your tour’s itinerary.

7. Conclusion

But Islet (Pen Islet) may be small, but it carries big meaning. Its pen-like shape rising from the emerald waters of Lan Ha Bay makes it one of the most symbolic and eye-catching formations in northern Vietnam. For travelers who enjoy photography, culture, and unique landscapes, But Islet is an unforgettable stop.

If you’d like to explore Cat Ba Island, feel free to contact Cat Ba Du Ky Travel at +84 989 745 338 for travel advice. You can also check out our full-package Cat Ba tours below: