
After lunch in Muara Muntai, we continued our journey to Tanjung Isuy, our final destination for the day. We would spend the night at a traditional Dayak Long House, offering a unique opportunity to experience the local culture.
As our motorboat cruised slowly along the Mahakam River, we admired the peaceful scenery while keeping our eyes on the water, hoping to spot the elusive Pesut Mahakam.
The Pesut Mahakam (Orcaella brevirostris), also known as the Mahakam freshwater dolphin, is one of Indonesia’s rarest animals. It inhabits the Mahakam River in East Kalimantan and is a critically endangered population of the Irrawaddy dolphin. Today, only around 80 individuals are believed to remain in the wild, making every sighting incredibly special.
Unfortunately, we weren’t lucky enough to see any dolphins during our trip. However, the journey was far from disappointing. Along the riverbanks, we spotted numerous bird species flying overhead and searching for food, while the untouched rainforest created a peaceful backdrop throughout the ride.
Lake Semayang and Lake Melintang
Lake Semayang and Lake Melintang are two of the largest freshwater lakes in East Kalimantan. Lake Semayang covers approximately 13,000 hectares, while Lake Melintang spans around 11,000 hectares. Together, they form part of the Mahakam River Basin and are surrounded by lush tropical rainforest.
These lakes play an important role in the region’s ecosystem, providing habitat for a rich variety of fish, birds, reptiles, and other wildlife. They also support the livelihoods of local communities, many of whom depend on fishing and traditional river transportation.
Things to Do at Lake Semayang and Lake Melintang
- Take a boat tour – Cruise across the lakes to enjoy the tranquil scenery, floating vegetation, and abundant wildlife.
- Go birdwatching – The lakes are home to many resident and migratory bird species, making them an excellent destination for nature lovers.
- Try fishing – Fishing is one of the main activities around the lakes, and visitors can experience the local way of life.
- Visit Dayak villages – Explore nearby Dayak villages to learn about their traditions, culture, and daily life.
Travel Tips for Visiting Lake Semayang and Lake Melintang
- Visit during the dry season (June to September). Water levels are generally more stable, making boat travel safer and more comfortable.
- Arrange transportation in advance. Public transportation is limited, so joining a tour or hiring a private vehicle and boat is the most convenient option.
- Pack the essentials. Bring lightweight clothing, sunscreen, insect repellent, a hat, drinking water, and any personal medications.
- Respect local communities and wildlife. Help preserve this unique ecosystem by avoiding littering and minimizing noise while exploring the lakes.

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