Where did the big battle between Athens and Sparta take place?

There were many battles between Athens and Sparta. They also fought on the same side several times. There was a war between Athens and its allies and Sparta and its allies, which we now call the Peloponnesian War (431-404 BCE) for no good reason, as it was fought throughout the Mediterranean from Sicily to Asia Minor. It contained many battles. Did you have one in particular in mind?