claims to present-day Somerset County, surveying a dividing line between the two colonies with Surveyor General of Virginia, Edmund Scarborough. Meanwhile, he negotiated treaties with Lower Eastern Shore Indian tribes harassing English settlers. These treaties defined standards of conduct for Indian-English relations, establishing an overall peace in the region. The northern limit is harder to locate. Some dispute Cecil County as a true Eastern Shore territory due to Interstate 95's presence in its surrounding developments and its proximity to and influence from nearby urban areas such as Philadelphia, Wilmington, and Baltimore. It straddles the Elk River, resulting in 50% of the county being west of the Shore. Like New Castle County, Delaware, Cecil County is crossed by the Fall Line, a geologic division where the rockier highlands of the Piedmont region meet the Atlantic coastal plain, a flat, sandy area that forms the coast. The coastal plain includes the Delmarva Peninsula and hence the Eastern Shore of Maryland. The geology of Delmarva is an inseparable part of the Eastern Shore, which has few rocky outcrops south of Kent County. The Chesapeake and Delaware Canal crosses from Back Creek on the Elk River to Port Penn, Delaware. While it was a shallow canal with locks after its construction in 1829, it was deepened in the early 20th century to sea level, and physically separates the Delmarva Peninsula from the rest of the United States. Maryland south of the canal is considered the Eastern Shore by residents. The term Western Shore is used by Eastern Shore residents to describe all the counties of Maryland west of the Chesapeake Bay, but especially those of the Baltimore-Washington metropolitan area and Southern Maryland. The north–south section of the Mason–Dixon line forms the border between Maryland and Delaware. The border was originally marked every mile by a stone, and every five miles by a "crownstone". The line is not quite due north and south, but is as straight as survey methods of the 1760s could make it. It was surveyed as a compromise solution to a century-long wrangle over colonial territory between the Penn and Calvert families of England. If the Chesapeake Bay/Delaware Bay watershed divide had been taken as the borderline, the state of Delaware would be about half its current size. History Early history William Claiborne was granted land (part of the Colony of Virginia) in 1629 and named the land "Kent County". In