Due to the city's rich geologic history and proximity to water bodies, researchers discovered a variety of forests in New York City, ranging from oak-and-hickory-dominated forests along the terminal moraine that stretches from the southern end of Staten Island to the Bronx, to maritime coastal forests, primarily in Brooklyn. These forests were destroyed over time by humans who settled the area or used them for fuel. Today, only 7 percent of Manhattan is still covered with natural vegetation. The rest is made up of buildings, roads, and parks. But there are plans to restore part of the island to its natural state. Manhattan's remaining forests are mainly on city-owned property, including but not limited to Central Park, which covers 385 acres (1.5 km2) near the center of the island, and Roosevelt Island, which is partially owned by New York City but is not open to the public. There are also small clusters of trees on privately owned rooftops that have been preserved through laws requiring roof gardens be left in place after a certain period of time has passed. These include trees on top of Rockefeller Center and the GE Building in Downtown Manhattan. In Brooklyn, several neighborhoods have large tracts of forest park land, which are protected areas within the city limits where trees are grown for use as urban green space. These include Fort Greene Park, Hamilton Beach Park, and Sheepshead Bay Park. There are also many smaller wooded parks throughout the borough.