The line actually runs slightly northwest to southeast, so it follows no line of latitude. This gave New Hampshire even more than it had claimed, as Pawtucket Falls was south of the mouth of the Merrimack. At this time, the present northern boundary of Massachusetts was established.

The location where these two surveyed lines met (the straight westward line and the curved line following the Merrimack River) was marked by a pine tree called the "Old Boundary Pine". The tree was marked by George