Rehoboth Beach ( ) is a city on the Atlantic Ocean along the Delaware Beaches in eastern Sussex County, Delaware. As of the 2010 U.S. census, the population was 1,327, reflecting a decline of 161 (11.2%) from the 1,488 counted in the 2000 census. Along with the neighboring coastal town of Lewes, Rehoboth Beach is one of the principal cities of Delaware's rapidly growing Cape Region. Rehoboth Beach lies within the Salisbury metropolitan area. A popular, affluent vacation destination, many individuals maintain summer homes in Rehoboth Beach, including current U.S. President Joe Biden. During on-season, Rehoboth Beach's population expands to over 25,000 within the city limits and thousands more in the surrounding area in the summer. In 2011, the NRDC awarded Rehoboth Beach with a 5-Star rating in water quality. This award was given only to 12 other locations, one being neighboring Dewey Beach. Out of the 30 states with coastline, the Delaware Beaches ranked number one for water quality in 2011. History Many centuries ago, sea levels were lower, and the Atlantic Coast lay about farther east than it does today. At the time, the area would have resembled inland portions of southern Delaware today. By the time the first Europeans arrived in the area in the 17th century, the coastline was at its present location and several Native American Indian tribes lived in the area, including the Lenape (or Delaware), the Sikkonese, the Assateagues, and the Nanticoke. The site was the location of what may have been the most important Native American fishing village on the Middle Atlantic coast (the evidence has been obliterated by development, such as the Wilgus Site a prehistoric shell midden archeological location which is now inundated). Pressure from English and Dutch settlers radiating outward from Cape Henlopen near Lewes, Delaware at the entrance to Delaware Bay forced the Lenape to migrate to upper New York state, eastern Canada, and eventually to the west in Indian Territory (later formed Oklahoma, Kansas, parts of Arkansas) while the Sikkonese and Assateagues were extirpated; the Nanticoke, however, still exist in the general area today. The land later came under the control of the Duke of York, younger brother of King Charles II who also seized and occupied in 1664 the Dutch colony further north at the mouth of the Hudson River on Manhattan Island and adjacent Long Island as New Netherland with Fort Amsterdam and the village