The eastern border of Chile is for the most part, the country of Argentina. Chile also has a small border to the east with Bolivia.
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The countries of Jordan and the West Bank border Israel's eastern border.
italy
France
France's smallest neighbor along its eastern border is Luxembourg.
The New Madrid (pronounced maaa'-drihd) Faultline follows the Mississippi river along Missouri's eastern border.
The Amur River flows mostly through China, but a portion flows through Russia and along the border of China and eastern Russia.
Illinois
Eastern Front
the Mississippi
Barrier island
There is no country sandwiched between Iraq and Persia. The two states/regions share a border along the Zagros Mountains.