Karachi is in Southern Pakistan. It is the capital of the Pakistani province Sindh, and is the largest city in the country. It is also the most populated city, and is one of the most important cities when it comes to things ranging from businesses to culture.
Karachi has some tourist attractions (although to some, they may not seem all that great). For example, the town is filled with many shops and bazars where visitors may purchase a wide variety of goods. There is also an area called Clifton (or Klifton) where many beaches, and other nice places exist. These nice places range from a McDonalds (those are really popular there) to a bowling alley named Area 51 (the entire theme is related to extraterrestrial life) to some malls.