are the product of dredging the Anacostia River over 100 years ago and are now home to important and rare ecosystems, including tidal freshwater wetlands, vernal pools, wildflower meadows, and tidal swamp forests. The islands are home to more than 100 different species of birds, mammals, and other wildlife.

In February 2018, Mayor Bowser announced significant conservation and investment commitments for Kingman + Heritage Islands and directed the DC Department of Energy and Environment (DOEE) to designate portions of both islands as a State Conservation Area and the southern area of Kingman Island as a Critical Wildlife Area. The State Conservation Area designation mimics the federal covenant for the islands, restricting their use to environmental, educational, and recreational purposes. In addition, the Mayor also announced a new $4.7 million investment for educational and recreational improvements on the islands.