twin island is part of pelham bay park in the bronx, also part of the hunter island marine sanctuary. it is located east of hunters island and north of orchard beach. it is wooded with exposed bedrock with glacial grooves. east and west twin islands (or the "twins") were once true islands in pelham bay but are now connected to each other and to orchard beach and nearby rodman's neck by a landfill created in 1937. east twin island is connected to neighboring two trees island via a thin mudflat landbridge, which is submerged at high tide. west twin island was at one time connected to neighboring hunter island via a man-made stone bridge,history in asphalt: the origin of bronx street and place namesneighborhood report: bronx up close, new york times, july 9, 1995 that now lies in ruins in one of the city's last remaining salt marshes. member species of the islands' salt marsh ecosystem include egrets, cormorants, fiddler crabs, horseshoe crabs, and marine worms. the two islands that are now combined as twin island have been owned by the new york city parks department since 1888. ==references==  ==external links== *twin island marsh restoration orchard beach, the bronx 
Landforms_of_Bronx_County,_New_York Long_Island_Sound Protected_areas_of_the_Bronx