There is no way to answer this because there is no place where "East" stops. It's just a direction compared to where you are at the moment, so there's no place actually called "East." If you keep going in an easterly direction, you'll end up back where you started because the world is round.
cuba
barbados
mount. wanalanahuie island
Somalia is the farthest country east.
Russia lies farthest to the east
The farthest north country is Denmark (via Greenland). The farthest east country is Kiribati.
Maine is the farthest east state.
Yemen is the farthest-south country in the Middle East.
Lake Ontario is farthest East out of the Great Lakes.
MaineMaine.
Augusta, Maine is farthest east.
About 20 degrees east latitude to 40 degrees east latitude.