Ma Da Valley and Lake

Ma Da is a valley in the strictly protected core zone of Phong Nha-Ke Bang, with a jungle lake at its centre that most groups swim in before lunch, and there is no road to it. The only way in is on foot, on a guided trek, with day trips from 1,950,000 VND. If you want a single day that combines real jungle trekking, a swim in water clear enough to watch your own feet, and a piece of wartime history told in the place it happened, this is the day that does it.

The lake is the centrepiece. It is deep enough for proper swimming rather than wading, and ledges above the water give optional jumps at five and ten metres; plenty of people climb up, look down and climb straight back, and nobody minds. Because the valley can only be reached on foot it stays quiet in a way the ticketed sites near the road never do, and the same quality makes it the campsite for several overnight trips: the two-day Ma Da Valley Jungle Camping trip at 5,175,000 VND, the gentlest overnight in the area with no rope work, and the Victory Cave Expedition at 7,650,000 VND, which camps at the lake.

The walk in carries the history. Elephant Cave, a large cave on the approach, sheltered Vietnamese soldiers during the war, close to Route 20 Quyet Thang, the supply road you drive in on, and guides tell that story inside the cave itself rather than from a plaque. The valley is also where Phong Nha's newest cave was found: Hang Thang, marketed as Victory Cave, announced in June 2026 after a local resident reported an entrance he had first spotted in 2023. That a valley this close to the road network still produced a cave discovery of that size says something about how unfinished the map of this park is.

The standard day out is the Elephant Cave and Ma Da Valley Jungle Trek at 1,950,000 VND, minimum age 9, with pickup from Dong Hoi included, which quietly solves the transport problem for anyone based there. Several of the day itineraries finish with a swim through Tra Ang cave, over 600 metres of river cave done with headlamps, life jackets and a safety assistant in the water, which turns the last hour of the day into its own small adventure. Jungle Boss holds the licences for the treks in this part of the park, and non-swimmers manage the cave section regularly.

Season matters the way it does everywhere in Quang Binh, the province merged into Quang Tri in 2025. February to August is the dry window and March and April are the sweet spot; the lake is at its most inviting exactly when the trekking is hottest, which is the trade the valley offers. From September to November flood risk rises sharply, treks get cancelled or rerouted, and in bad years park tourism has been suspended outright, so build slack into any late-year plan.

Getting there starts with getting to the area. Dong Hoi is the gateway, with an airport and a mainline train station: about 3 hours by train from Hue, 4 to 5 from Da Nang, and about 10 from Hanoi, with the overnight sleeper as the comfortable option. Phong Nha town is 45 to 90 minutes onward by taxi or the 35,000 VND local bus, and sleeper buses run direct to town from Hue, Hanoi and Ninh Binh. From either Dong Hoi or Phong Nha town, the tour handles the rest of the journey to the trailhead on Route 20, so the valley asks nothing of you logistically except turning up on time with a swimsuit.

Don't miss

• A clear jungle lake most groups swim in before lunch
• Optional cliff jumps from ledges at 5 and 10 metres
• Elephant Cave and its wartime shelter history on the walk in
• The valley where Hang Thang, the Victory Cave, was found in 2026
• Campsite for several overnight tours
• Day treks from 1,950,000 VND with Dong Hoi pickup included
• Core-zone jungle reached only on foot

Good for

Getting there

Know before you go

• There is no road to the lake; the valley is reachable only on a guided trek.
• The cliff jumps at 5 and 10 metres are optional, and plenty of people skip them.
• Several overnight tours use the lake as their campsite, so you may share the shore with tents.
• Most of the day involves water, so bring a waterproof bag for anything you cannot afford to soak.
• The standard day trek has a minimum age of 9 and includes pickup from Dong Hoi.
• Several day itineraries end with the Tra Ang cave swim: over 600 metres of river cave with life jackets and a safety assistant in the water.
• September to November is flood season; core-zone treks get cancelled or rerouted, so keep late-year plans flexible.

A bit of history

Elephant Cave, on the walk into the valley, was used as a shelter by Vietnamese soldiers during the war. It sits close to Route 20 Quyet Thang, the supply road that trips still drive in on, and guides tell the story inside the cave itself rather than from a signboard, which lands differently. The valley returned to the news in 2026: a local resident had spotted an unrecorded cave entrance in 2023, reported it in June 2026, and a six-day survey with the national park board followed. The discovery of Hang Thang, roughly 3,000 metres of passage with thousands of cave pearls on its floor, was announced on 25 June 2026, and tours were running within weeks. Few places show both ends of the park's story this clearly: a wartime shelter on the walk in, and a brand-new discovery in the same valley.