The eastern border of New York state isn't straight; there are a lot of bends and squiggles. But it averages out around 73 degrees 20 minutes west.
Except for Long Island; the eastern tip of Long Island is 71 degrees 50 minutes west.
Two rivers partially form Illinois State's Eastern boundary. The Wabash River is one river that forms Illinois' boundary. The Ohio River is the other river that forms the state's boundary.
Mississippi
Mississippi River
The Mississippi River forms the western boundary of the State of Illinois.
The entire western boundary of Kansas is included in the border of Colorado.
The Mississippi River serves as the eastern boundary of the state of Missouri.
The Atlantic Ocean forms the state's eastern boundary.
In most cases the eastern boundary of something will touch the western boundary of the next door something. Where "something" can be a state, province, country, estate, ocean, lake river, Earth plate etc.
The eastern border of Western Australia is defined by 129 degrees E latitude.
The state of New York is bordered on the east byConnecticut,Massachusetts, and Vermont.
Japan river
Russia does not share an eastern border with anyone, but it is on the coast of the Bering Sea and just across that is the US state of Alaska.