Nusa Lembongan has a mangrove forest in the northeast. The trees trunks are not rooted in the ground, but sit on a dense tangle of air roots that filter the water below. They run boat tours there; I found a tour guide with a boat on Lembongan’s sparsely populated north coast. Quite unlike the mangroves in the Sundarbans in Bangladesh, a few pages down on this blog!
Getting there from Nusa Penida involves very long walk to the right harbor, and then crossing over to Lembongan to the Yellow Bridge that connects Lembongan to Ceningan. And finally I had to walk to the opposite side of Lembongan; I seem to have picked a scenic but very steep path through the forest. My step counter hit 10,000 before 9 o’clock in the morning. Fortunately the food is good here and there is no Ramadan!