The Alvarado mangroves ecoregion (WWF ID: NT1401) covers a series of mangrove forest areas along the Gulf of Mexico coast of the states of Tamaulipas and Veracruz in Mexico.

The largest tracts of mangrove swamps occur at the mouths of rivers, and nearby coastal lagoon.

[1][2][3] The Alvarado mangroves form in large areas at river mouths where fresh water from the interior mixes with saltwater from the Gulf in proportions that provide an advantage to salt-tolerant mangrove tree species.

Mangroves in this area are the farthest north, and are characterized by higher levels of freshwater than further south.

[1] Characteristic birds of the area include the sungrebe, black-collared hawk, bare-throated tiger heron (Tigrisoma mexicanum), the tricolored heron (Egretta tricolor), the near-threatened reddish egret (Egretta rufescens), the jabiru (Jabiru mycteria), the wood stork (Mycteria americana), that swallow-tailed kite (Elanoides forficatus), the zone-tailed hawk (Buteo albonotatus), the amazon kingfisher (Chloroceryle amazona), and the prothonotary warbler (Protonotaria citrea).