According to the World Atlas, parts of Antarctica, Australia, the southern islands of Asia and the southern part of Africa are in both the Eastern and Southern Hemispheres. A number of large islands are in both hemispheres as well, including Madagascar and New Guinea.
The Southern Hemisphere divides from the Northern Hemisphere at the Equator, the imaginary line girdling the center of the Earth. As such, it includes parts of Antarctica, Africa, South America, the southern islands of Asia, and Australia. The Eastern Hemisphere comprises all of the planet east of the Prime Meridian and west of 180 degrees longitude. It includes parts of Asia, Africa, Antarctica and all of Australia.