Maratua Island · East Kalimantan · Indonesia
Hidden within Maratua Island lies a rare natural wonder — a vast freshwater lake surrounded by tropical forests, limestone caves, and crystal-clear seas.
About the Destination
Goa Gumantung is an emerging eco-tourism destination located on Maratua Island, East Kalimantan. Surrounded by tropical forests, calm waters, and natural cave formations, the area offers visitors an authentic island experience with a character that is rare within the Indonesian archipelago.
With an estimated 25-hectare freshwater lake, natural limestone caves, and marine ecosystems nearby, Goa Gumantung is one of the archipelago's rare undiscovered natural assets with meaningful potential for sustainable eco-tourism development.
Total Area (est.)
Freshwater Lake (est.)
Lake Length (est.)
Max. Depth (est.)
Prime Location
What Sets It Apart
Scale of the Site
Approximately ±236,000 m² total — including the freshwater lake, cave formations, tropical forest, and coastal access.
Origins & History
The name Goa Gumantung — meaning "the hanging cave" in the local tongue — speaks to the dramatic limestone formations that define this place. The cave's entrance appears suspended above the forest floor, its mouth framed by ancient stalactites that have formed over thousands of years.
For generations, the Bajau Laut people of Maratua have known this landscape intimately. The freshwater lake was historically a source of clean water and a place of quiet refuge. Local elders speak of the lake as a living presence — fed by unseen springs deep within the island's limestone heart.
What makes Goa Gumantung geologically remarkable is the coexistence of a deep freshwater lake and a saltwater marine environment within the same island system. This rare juxtaposition — freshwater above, ocean surrounding — gives the site a character found in very few places in the archipelago.
The land remains largely as nature left it. No major development has altered its landscape. That unchanged quality is both its greatest asset and its most compelling story for conservation-minded investors and eco-tourism developers.
What to Do
From serene lake paddling to cave exploration — Goa Gumantung offers a range of experiences set within an unspoiled natural landscape.
Explore the calm, freshwater lake by traditional canoe. A peaceful journey through an unspoiled natural landscape.
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Paddle through hidden waterways and discover the quieter corners of Goa Gumantung's natural landscape.
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Enjoy a refreshing swim in the freshwater lake, surrounded by the lush tropical forest of Maratua Island.
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Venture into the natural limestone formations of Goa Gumantung and witness the cave's remarkable geological character.
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Explore the rich coral ecosystems of Maratua's surrounding waters, just minutes from the freshwater lake.
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Walk through tropical forest trails and discover the diverse flora and fauna of East Kalimantan's island landscape.
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Capture striking scenery at every turn — sunrise over the lake, cave silhouettes, and the rich colours of coastal life.
Learn MoreNatural Ecosystems
Goa Gumantung sits at the intersection of four distinct ecosystems, each supporting its own community of life.
Wildlife observations are based on general Maratua Island ecosystem data. A site-specific biodiversity survey is recommended as part of formal development planning.
The Golden Hour
Surrounded by untouched tropical nature, the sunset at Goa Gumantung is a quiet, unhurried moment — the kind that reminds you why some places are worth protecting.
The Experience
An estimated 25-hectare freshwater lake — a rare natural formation that gives Goa Gumantung a distinctive character in the region.
A pristine landscape where limestone cave formations, dense rainforest, and vibrant coral ecosystems exist in close proximity.
From canoeing and cave exploration to jungle trekking and snorkeling — a range of nature-based activities in one location.
A sustainable development initiative designed to protect Maratua's natural heritage while creating meaningful visitor experiences.
Development Journey
Goa Gumantung is at an early stage — which means the opportunity to shape its future is still open.
Natural assets, intact and undeveloped — ready to be shaped by the right vision.
A phased development plan focused on eco-tourism and sustainable infrastructure.
Site Overview
An illustrative overview of the ±23.6 Ha site, showing the lake, cave, and planned development zones.
Illustrative plan — marker positions are approximate. Formal masterplan subject to detailed survey and development planning.
Visual Journey
A glimpse into the natural landscape that awaits at Goa Gumantung.
Vision for Tomorrow
Goa Gumantung is positioned as one of Maratua Island's emerging eco-tourism assets. The development vision focuses on sustainable growth that works with nature, not against it.
Boutique eco-accommodation nestled within the forest, offering guests immersive stays in harmony with the natural environment.
Glamping sites overlooking the freshwater lake — a comfortable camping experience with views of untouched nature.
Open-air dining with local seafood and Indonesian cuisine, set against the backdrop of the tropical lake and forest.
Elevated deck structures offering panoramic views across the freshwater lake, forest canopy, and Maratua coastline.
A planned dive facility offering guided dives and courses for visitors looking to explore Maratua's rich underwater ecosystems.
Central hub for kayaking, canoeing, paddleboarding, and guided lake tours — the operational heart of water activities.
Open-air event venue for private gatherings, corporate retreats, and eco-cultural experiences set in nature.
Dedicated zones protecting the endemic flora, fauna, and marine biodiversity of Maratua Island for future generations.
Rare Opportunity
Goa Gumantung presents a rare opportunity to participate in the development of one of Maratua Island's most promising eco-tourism destinations — at an early stage, on strategically valuable land, with significant natural assets already in place.
Situated on Maratua Island, a known diving and nature tourism destination in East Kalimantan, with growing visitor interest from national and international markets.
Approximately ±23.6 hectares of titled land, providing full development rights and long-term asset security for investors and development partners.
An estimated 25-hectare freshwater lake — a rare natural asset that adds significant character and appeal to the site's long-term development potential.
Indonesia's nature and eco-tourism sector shows consistent growth. Maratua's relative remoteness and limited existing development create a meaningful window of opportunity for early participants.
Aligned with global eco-tourism trends and Indonesia's national sustainability agenda, with potential access to green investment frameworks.
How to Get Here
Fly into Kalimarau Airport, Berau (BEJ) from Jakarta, Balikpapan, or Makassar. Daily flights available with multiple airlines.
Take a speedboat from Tanjung Batu port to Maratua Island. Journey takes approximately 2–3 hours across the Sulawesi Sea.
From Maratua's main village, reach Goa Gumantung by motorbike or local jeep. Guided transfers available upon request.
Get in Touch
Whether you're planning a visit or exploring investment opportunities, we'd love to hear from you.
