Quick answer: Go at mid to high tide, when there's enough water in the channels. Local boatmen pole wooden boats through the forest in a quiet trip of under an hour; kayaks and paddleboards are an alternative. At low tide, boats can't get in.
The north-east of Lembongan is a mangrove forest: trees that grow in salt water, standing on tangled roots above the tide. Channels run through it, and at the right tide you can glide between the trees in silence, with only the sound of a bamboo pole in the water.
Timing is everything
Go at mid to high tide. At low tide the channels drain and the boats simply can't get in. A tide table tells you the time; the boatmen on the shore know without looking.
Boat, kayak or paddleboard
The classic way is a wooden boat poled by a local boatman, no engine, through the narrow channels. It's calm, quiet and short, usually well under an hour. Kayaks and stand-up paddleboards let you go at your own pace, but stay in the sheltered channels; the open water outside can have strong currents.
What you'll see
Roots arching out of clear, shallow water, small fish and crabs, birds in the canopy, and the cool shade of the forest. It's one of the most peaceful hours you can spend on the island, and a good one for families.
Mangrove Point
At the north-east tip, beyond the forest, is Mangrove Point, a gentle drift snorkel on a calm day. More on snorkelling.
Why it matters
Mangroves protect the coast from waves and storms, and shelter young fish that later live on the reef. Keep to the channels, don't break branches, and take your rubbish home.
Questions
When is the best time to visit the Lembongan mangroves?
At mid to high tide. At low tide the channels drain and boats can't get through. Check a tide table, or ask the boatmen.
How do you tour the mangroves on Nusa Lembongan?
Most people take a boat poled by a local boatman, a quiet trip through the channels. Kayaks and stand-up paddleboards are also available.
Can you combine the mangroves with snorkelling?
Yes. Mangrove Point, at the north-east tip, is a popular snorkel spot, and many snorkel trips pass the mangroves.
The seaweed farms
Surfing
Lembongan or Penida