Within Boca Chica’s cove there are two small islands.  More or less in the center is a mangrove isle named Las Maticas, There is very little firm ground on this mangrove but it is home to thousands of birds called "garzas" (herons).  Many visitors enjoy wading out to the shore of the mangrove and just hanging out, as the water off-shore is only a couple feet deep and it recedes gently up along a soft and smooth sand bar.  A narrow waterway cuts through the center of the mangrove and curious visitors like to float through in a boat, just to see where it goes.