The marshes within this Important Bird Area support a population of Saltmarsh Sharp-tailed Sparrows that may be increasing due to the restoration efforts at Jacob's Point. Restoration efforts at Jacob's Point have focused on restoring tidal flow through a culvert that had formerly fallen into disrepair and became clogged. Tidal restoration has helped to limit the extent of common reed invasion into the salt marsh from adjacent freshwater wetlands.

Two large patches of salt marsh comprise a majority of this Important Bird Area located at the mouth of the Warren River whereupon the river discharges to Narragansett Bay. One marsh is located on the west side of the river mouth at Rumstick Point, and the other is on the east side of the river mouth at Jacob's Point. The marsh at Rumstick Point is approximately 40 acres. The marsh at Jacob's point is approximately 47 acres.