East City is where Orin Temple is located. West of the city, next to Orin Temple, there is a Bamboo Forest. East City is where Vegeta and Nappa first land when they arrive on Earth. The major part of the city is completely destroyed when Nappa launches a Volcano Explosion shortly after reaching Earth with Vegeta, reducing the city to rubble. Vegeta admonishes Nappa afterward, conjecturing that there may have been a Dragon Ball there.
East City Ruins It was never mentioned if the inhabitants of this city killed by Nappa were revived by the Dragon Balls or not. We can safely assume they were through the course of the series.

Contains the 7 Star ball.