Than Mayom Waterfall is located in Mu Ko Chang National Park, in the Koh Chang subdistrict, Koh Chang district, Trat province. It is a medium-sized waterfall of great historical and natural significance for Koh Chang.

• Features: A medium-sized, four-tiered waterfall, formed by a stream flowing through channels in black granite, nestled within a lush, shady tropical rainforest. The third tier is considered the most beautiful.

• Historical Significance: This place is considered the source of holy water for Koh Chang. King Chulalongkorn (Rama V) visited the waterfall nine times in the past; King Vajiravudh (Rama VI) and King Prajadhipok (Rama VII) also visited. To this day, the royal monograms of these monarchs are carved into the granite rock face.

• Opening hours: Open daily from 8:00 am to 4:30 pm.

• Entrance fees (entrance prices for national parks)

• Thai nationals: Adults 40 THB, children 20 THB

• Foreign nationals: Adults 200 THB, children 100 THB

(Note: Entrance ticket for the national park) (Can be visited on the same day as the Khlong Phlu Waterfall.)

Activities and highlights at Than Mayom Waterfall

• Nature walks: The path to the first stage of the waterfall is a short walk – about 500 meters (approx. 5–10 minutes) from the National Park ranger station – which leads through shady orchards and evergreen forest.

• Swimming: Natural pools and ponds are available for swimming at certain water levels. (Please check with park staff for water levels and safety conditions, especially during the rainy season.)

• Nature trails and hiking: Longer hiking trails are available (a park guide is required), including routes that follow the paths of royal visitors, link to the west side of the island, or lead to various historical sites.

• Best time to visit: The waterfall is most beautiful from July to December (rainy season until the beginning of the cooler season) when it carries the most water. During the dry season (February to April), the water level can be low.

• Clothing and equipment: Wear sandals with secure straps or shoes with good grip, as the rocks around the waterfall can be slippery – especially after rainfall.

• Getting there: The location is on the east side of Koh Chang and is easily accessible by rental car or your own vehicle; a parking lot is available at the national park office.