Khao Cha-ang On Cave is a geological treasure of Chonburi, characterized by a massive limestone mountain rising prominently from the surrounding plains. Hidden within this mountain is a colossal cavern hall so vast that it can accommodate over 1,000 people. The interior features a remarkable natural ventilation system, ensuring a cool and refreshing atmosphere year-round. Currently under the care of Wat Khao Cha-ang On, the cave has been transformed from a wild natural site into a sacred and serene sanctuary, housing beautiful Buddha images where devotees can practice meditation and find spiritual peace.

The jewels of the cave are the exquisite stalactites and stalagmites formed over millions of years. These geological masterpieces resemble frozen waterfalls, intricate corals, and even diamond-like glitters when touched by light. Beyond its physical beauty, the cave serves as a vital sanctuary for millions of insect-eating bats, which play a crucial role in the local agricultural ecosystem by controlling pests. This biological abundance is a testament to the pristine forest conditions that still thrive in the Bo Thong area.

As the clock strikes the Golden Hour (17:30 - 18:30), the cave entrance becomes a world-class stage for a natural performance. Visitors will witness the Bat Army Phenomenon, where millions of bats emerge simultaneously, forming a long, winding "smoke-like" ribbon across the sky. This living stream continues for several minutes, creating a powerful and mystical sight against the backdrop of the setting sun, enhancing the beauty of their nightly migration.

This location serves as a natural studio for photographers seeking high-contrast abstracts or powerful silhouettes. For families, it is one of the best outdoor classrooms to teach children about wildlife cycles and geology. Meanwhile, couples and slow-life travelers are often moved by the deep silence and the simple yet grand spectacle that nature provides.

We invite you to discover the secrets beneath the earth at Khao Cha-ang On Cave—a place where the rhythmic beating of a million wings composes a symphony of life, and where time itself has sculpted a masterpiece that will become a cherished memory of your visit to Chonburi.

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How to Get There

• By Private Car: From Ban Bueng District, take Highway 331 towards Bo Thong District. Turn onto Highway 3245 and follow the signs to "Wat Khao Cha-ang On." The road is paved and easily accessible for all vehicles.

• By Public Transport: Hire a local vehicle from Bo Thong District town or use a local songthaew that passes through the Phluang Thong Subdistrict area.

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Travel Tips

• Best Season: Accessible all year round, but the Winter season (November – February) is most popular due to the dry, comfortable weather and clear visibility of the bats.

• Equipment: Bring a high-powered flashlight to appreciate the intricate details of the limestone in darker corners, and wear sneakers with good grip as some cave floors can be damp and slippery.

• Photography: Use a high shutter speed to capture individual bats or a long exposure to capture the "ribbon" effect of the colony across the sky.

• Cave Etiquette: Please refrain from making loud noises or using direct flash on the bats while they are roosting, as it disrupts their natural behavior.

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Admission Fee:

• No Admission Fee.

Opening Hours:

• Daily: 08:00 – 18:30

• The bat colony typically begins its departure around 17:45 (varies slightly depending on the daily light)