Flooded Forests of Cambodia

Overview

Cambodia's flooded forests are among Southeast Asia's most extraordinary natural phenomena. During the monsoon season, the Mekong River and Tonle Sap Lake dramatically overflow, submerging vast stretches of riverine woodland. Trees stand with only their canopies above water, creating a surreal underwater forest where fish swim between branches and kayakers paddle through treetops.

This seasonal flooding creates one of the world's most productive freshwater ecosystems—a critical spawning ground for Mekong fish species that feed millions across the region. For travelers, it offers a truly unique experience: gliding silently through a submerged forest, spotting wildlife adapted to this seasonal rhythm, and witnessing an ecosystem found almost nowhere else on Earth.

What Are Flooded Forests?

Flooded forests (called prey srolop in Khmer) are woodland areas that become seasonally inundated when rivers overflow during monsoon rains. Unlike swamps or marshes, these are true forests of tall trees—primarily species adapted to survive months underwater.

The Mekong's flooded forests are distinct from the Amazon's várzea or Africa's Congo swamp forests, though they share similar ecological dynamics. Cambodia hosts two major flooded forest systems: the Mekong River corridor (particularly around Stung Treng) and the Tonle Sap Lake floodplain.

Best Time to Visit

Timing is crucial for experiencing flooded forests at their most impressive:

Where to Experience Flooded Forests

Stung Treng - Mekong Flooded Forests

The Mekong flooded forests around Stung Treng offer Cambodia's most immersive experience. Here you can kayak through fully submerged woodlands—an otherworldly journey where you paddle at canopy level, weaving between treetops that normally tower above you.

• Location: 9+ hours north of Phnom Penh by bus
• Experience: True kayak-through-treetops experience at peak season
• Wildlife: Irrawaddy dolphins, fish eagles, giant catfish, turtles
• Tourism level: Low—authentic and uncrowded
• Conservation: Part of Ramsar-designated wetland of international importance

Read our complete Stung Treng guide →

Tonle Sap Lake - Cambodia's Great Lake

Tonle Sap's flooded forests are more accessible from Siem Reap and offer a different perspective. While not as immersive for kayaking (most tours are by boat), the lake's flooded forest fringe supports extraordinary birdlife, including Southeast Asia's largest colony of spot-billed pelicans.

• Location: 30-60 minutes from Siem Reap by road
• Experience: Boat tours through forest edges, floating villages
• Wildlife: Pelicans, storks, cormorants, rare waterbirds
• Tourism level: Higher—combine with Angkor temple visits
• Key sites: Prek Toal Bird Sanctuary, Kompong Phluk, Kompong Khleang

Wildlife & Biodiversity

Cambodia's flooded forests support remarkable biodiversity, serving as critical habitat for endangered species and as the spawning ground for fish that sustain millions:

Kayaking Tours

Kayaking is the quintessential way to experience flooded forests, especially in Stung Treng where you can paddle through fully submerged woodland:

What to Expect

• Duration: Half-day (3-4 hours) or full-day (6-7 hours) options
• Difficulty: Easy—calm water, no rapids, suitable for beginners
• Kayaks: Stable sit-on-top kayaks, single or tandem available
• Group size: Usually 2-8 people with local guide
• Included: Kayak, paddle, life jacket, guide, often water and snacks

Typical Tour Itinerary (Half-Day)

1. Early morning pickup (6-7am for best wildlife viewing)
2. Transfer to river launch point (30-45 minutes)
3. Basic kayaking instruction and safety briefing
4. 2-3 hours paddling through flooded forest
5. Wildlife spotting breaks, photography opportunities
6. Return to town by mid-morning/noon

Tour Operators

Costs & What to Bring

Typical Costs

• Stung Treng kayak tour: $25-50 per person (half-day)
• Tonle Sap boat tour: $20-35 per person (shared), $75-150 (private/birding)
• Prek Toal expert birding: $120-200 per person
• Transport to Stung Treng: $12-15 bus from Phnom Penh
• Accommodation: $8-30/night in Stung Treng

What to Bring

• Waterproof bag or dry bag for electronics
• Sunscreen and insect repellent
• Hat and sunglasses (with retaining strap)
• Quick-dry clothing and swimwear
• Water shoes or sandals that stay on
• Camera with waterproof case/bag
• Binoculars for wildlife spotting
• Reusable water bottle
• Light rain jacket (monsoon season)

Conservation & Ramsar Sites

Cambodia's flooded forests face increasing threats from hydropower dams, deforestation, and climate change. Conservation efforts center on two internationally recognized sites:

Stung Treng Ramsar Site

Designated in 1999, this 14,600-hectare wetland protects critical Mekong habitat including:

• Irrawaddy dolphin population (one of few remaining)
• Spawning grounds for Mekong giant catfish
• Seasonally flooded forest ecosystem
• Over 200 bird species

Tonle Sap Biosphere Reserve

The Tonle Sap (including Prek Toal) was designated a UNESCO Biosphere Reserve in 1997 and includes three Ramsar sites. It protects:

• Southeast Asia's largest waterbird colonies
• Critical fish nursery feeding 60+ million people regionally
• Unique reverse-flow hydrology (lake fills from river during monsoon)