The name derives from its eastern location adjoining New Brunswick. Its eastern point lunges into Grand Lake and North Lake on the Canadian border, accessible by the Boundary Road. Sunset Park and other camping areas are attractive vacation locations. U.S. Route 1 runs north-south through the middle of the township. Orient village is just east of Route 1 on the Boundary Road.
The town is a port of entry into the United States from Limestone, New Brunswick, Canada. In the north of the town, the Aroostook National Wildlife Refuge straddles the town line with Caswell. The disastrous impact on the community of the demise of Loring Air Force Base in the 1990’s may be told by Limestone’s sharp population decline. The School of Mathematics and Science, a high school for top students from across the state, is now located on the former military facility.