Hiking and snorkeling at Mount Anak Krakatau in one adventure

Discover how Mount Anak Krakatau offers a unique trip that blends volcanic hikes with snorkeling in Indonesia’s Sunda Strait.

Smoke rises from Krakatoa volcano on Java Island, Indonesia. Photo by De Agostini/Getty Images

By Rochem Noor and Sarah Oktaviany

If you’re dreaming of an adventure that combines the thrill of hiking a live volcano and the serenity of snorkeling in tropical waters, Indonesia’s Mount Anak Krakatau delivers both experiences in one unforgettable trip. Nestled in the scenic Sunda Strait between Java and Sumatra, hiking and snorkeling at Mount Anak Krakatau offers travelers a rare chance to explore dramatic landscapes above and below sea level.

In this article, we’ll walk through everything you need to know—from the volcano’s history and how to get there to snorkeling highlights and hiking details. Based on both personal experience and updated travel information, this guide will help you prepare for an extraordinary journey to one of Southeast Asia’s most iconic destinations.

A historical volcano born from destruction

Mount Anak Krakatau, or “Child of Krakatau,” emerged from the calamitous eruption of Mount Krakatau in 1883. That eruption, one of the deadliest in recorded history, annihilated the original peak, triggered massive tsunamis, altered global temperatures, and killed over 36,000 people. The explosion was so powerful that it was heard thousands of kilometers away, and it forever changed the geography of the Sunda Strait.

Today, Mount Anak Krakatau stands roughly 230 meters above sea level. Although relatively young by geological standards, it has grown steadily from the caldera left behind by its predecessor. The surrounding area now consists of four main islands: Sertung, Panjang, Krakatoa, and the central nature reserve, which encompasses Mount Anak Krakatau itself.

Despite its violent origins, the island has transformed into a thriving destination for ecotourism, attracting nature lovers, geology enthusiasts, and thrill-seekers alike.

Getting there: Two routes to Anak Krakatau

From Lampung (Sumatra)

One of the most popular ways to access the area is by departing from Canti Pier in South Lampung. This route is particularly favored by those joining open trips or organized group tours. The journey typically starts in Jakarta, where you take a ferry from Merak Harbor in Banten to Bakauheni Harbor in Lampung—a three-hour voyage.

From Bakauheni, you travel overland to Canti Pier. Then, a boat takes you to Sebesi Island, the closest inhabited island to Mount Anak Krakatau. Many itineraries include snorkeling stops at Sebuku Kecil and Sebuku Besar Islands before proceeding to Krakatau the next day.

From Banten (Java)

Alternatively, travelers can reach Anak Krakatau from Anyer Beach, Carita Beach, or Tanjung Lesung Beach in West Java. This route, which involves hiring a speedboat, is faster—taking around 1.5 hours to reach the volcano. However, it’s also pricier, with rental fees ranging around IDR 5.5 million for up to six people.

This option is ideal for those short on time or interested in a one-day trip focused on diving or fishing.

What to expect: Nature’s contrasts above and below

Snorkeling around Anak Krakatau

Snorkeling is one of the most breathtaking aspects of the journey. The waters of the Sunda Strait are teeming with marine life. Coral reefs, sea anemones, and schools of small, colorful fish create a vivid underwater panorama. On sunny days, the sea appears in rich gradients of blue and green, offering crystal-clear visibility and vibrant reef views.

Popular snorkeling stops near Sebuku Kecil and Sebuku Besar Islands feature calm, shallow waters perfect for both beginners and experienced snorkelers.

Relaxing on white sand beaches

The islands around Krakatau offer pristine stretches of white sand beaches. These beaches are more than just places to relax—they are ideal photo spots with the dramatic silhouette of Mount Anak Krakatau in the background. Visitors often enjoy grilled seafood caught fresh by local fishermen, and the sunsets here are genuinely magical, bathing the sky in deep oranges and reds as evening approaches.

Hiking Mount Anak Krakatau

The highlight of the trip is undoubtedly the hike itself. While climbing to the volcano’s actual crater is usually restricted for safety reasons, hikers can still explore the lower slopes and a designated hill on the island. The Krakatau Nature Reserve is the staging point for the hike, and visitors are greeted first by lush, tropical forest before transitioning into a barren, volcanic landscape.

The hike to the observation hill is relatively short, taking about 15 to 30 minutes, and is considered easy to moderate. The path is made of sand and rocks, which makes the experience feel more adventurous. From the summit of this hill, visitors are rewarded with panoramic views of the smoldering peak of Mount Anak Krakatau—an active volcano still shaping its destiny.

What makes it special: An adventure for all senses

Hiking and snorkeling at Mount Anak Krakatau is not just about checking off bucket list activities; it's a sensory immersion. The heat of volcanic ash under your boots, the scent of salt in the sea breeze, the surreal contrast between lush coastal flora and raw volcanic terrain—these details make the adventure both grounding and unforgettable.

Moreover, the journey provides a deep connection to natural history. It allows travelers to walk in the aftermath of one of Earth’s most dramatic events and witness the resilience of ecosystems that have regenerated in the shadow of destruction.

Tips for planning your trip

If you’re considering visiting Mount Anak Krakatau, here are a few practical tips:

• Timing: Dry season (April to October) is ideal for both hiking and snorkeling due to calmer seas and clearer weather.
• Permits and guides: You may need permits depending on your point of departure and group setup. Hiring a local guide is strongly recommended, not only for safety but also for insights into the region’s geological and cultural history.
• What to bring: Snorkeling gear, trekking shoes, sun protection, insect repellent, and drinking water are essentials. A camera or drone is also a good idea for capturing the incredible landscape.
• Respect nature: This is a protected area. Avoid leaving trash, do not disturb wildlife, and always follow guide instructions.

Why it’s worth it

In a world of over-tourism and increasingly similar travel experiences, hiking and snorkeling at Mount Anak Krakatau offers a rare and authentic blend of excitement and education. It’s a place where raw nature and rich history coexist, allowing you to explore not only physical landscapes but also the stories they tell.

From coral gardens to volcanic trails, this Indonesian wonder delivers a powerful reminder of the planet’s ever-changing face—and invites you to become part of that journey, if only for a few unforgettable days.