Mangroves: 11 Facts You Need to Know (2024)

These unique trees lead tough lives, but we’re all the better for it.

Fact 1: Mangroves can be a bit salty

Unlike most trees, mangroves can grow directly in salty or brackish water.^{Jump to references1} Their strategies for dealing with otherwise toxic levels of salinity vary — some species secrete salt after it is absorbed, while others filter out salt from the surrounding seawater.^{Jump to references2} Tweet this fact

Fact 2: Mangroves come in a variety of sizes

Though estimates vary, there are at least 50 — and maybe as many as 80 — mangrove species, ranging in height from small shrubs to trees that stand 40 meters above the water, but all species thrive in low-oxygen, high-saline coastal environments.^{Jump to references3, Jump to references4} Tweet this fact

Fact 3: Fish flock to mangroves

Mangroves, specifically the underwater habitat their roots provide, offer critical nursing environments for juveniles of many marine species, from tiny gobies to massive crocodiles.^{Jump to references5} Tweet this fact

Fact 4: Mangroves live on the edge

Mangrove forests can be found on the saltwater coasts of more than 100 tropical and subtropical countries, totaling more than 140,000 square kilometers (54,000 square miles)^{Jump to references6} — roughly the size of Greece or Arkansas. Tweet this fact

Fact 5: Indonesia tops the worldwide list

The largest amount of mangrove coverage can be found in Indonesia, where mangrove trees cover some 31,000 square kilometers (about 12,000 square miles)^{Jump to references7} — that’s more than twice the size of Jamaica or roughly the size of Maryland. Tweet this fact

Fact 6: Florida mangroves prefer the southern coast

The United States has roughly 2,000 square kilometers (about 800 square miles) of mangroves^{Jump to references7} — an area about four-fifths the size of Luxembourg — located almost entirely in southern Florida. Tweet this fact

Fact 8: Mangroves can help keep people safe

Mangrove forests — specifically, their thick, impenetrable roots — are vital to shoreline communities as natural buffers against storm surges^{Jump to references9}, an increasing threat in a changing global climate with rising sea levels. Tweet this fact

Fact 9: There’s trouble in Myanmar

Mangroves are under threat nearly everywhere, but the problem is particularly acute in Myanmar, where one study estimated^{Jump to references10} the mangrove loss rate is more than five times the global average. Tweet this fact

Fact 10: Shrimping is a jumbo problem

In Thailand, Mexico and Indonesia, mangroves are often cut down to make room for temporary shrimp pens. But once the pens have been removed, the accumulated biowaste renders the water too toxic for most forms of life.^{Jump to references3} Tweet this fact

Fact 11: It’s better to revitalize than replant

Mangroves’ dense root systems inhibit the flow of tidal water and encourage the deposition of nutrient-rich sediments. But once lost, mangroves are very difficult to replant due to shifts in the very sediments the roots helped keep in place.^{Jump to references11} Tweet this fact

Conservation International is an active partner in the Global Mangrove Alliance, an organization of technical experts, policy makers and non-governmental organizations dedicated to promoting mangrove conservation and regrowth.

The Alliance’s strategy aims to increase the extent of global mangrove habitats by 20 percent by 2030, an ambitious target that will pay dividends for climate change mitigation, biodiversity and the well-being of coastal communities around the world.

In addition to its work with the Alliance, Conservation International works with local communities to protect and revitalize mangrove ecosystems in Indonesia, where logging, mining and commercial development place critical mangrove habitats at risk. As part of this effort, Conservation International has collaborated with policy makers in Indonesia’s West Papua province to establish firm conservation guidelines, including the placement of 30 percent of coastal waters in marine protected areas and the elimination of threats for 100 percent of the provinces mangrove habitats.