Marathon and Plataea.
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Check in your old History textbook
There are 9 mainland regions in greece
Persia was trying to incorporate mainland Greece within its empire. Many of the Greek city-states resisted.
The Greek city-states of Asia Minor were induced to rebel against Persian rule. Cities from mainland Greece intervened, inducing Persia to determine to bring them under control. Many agreed, but some resisted, and the Persians invaded to establish control over them.
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Persia lost.
Mainland Greece in ancient times was not part of the Persian Empire, though many Greek lands in what is now Turkey were conquered by Persia. It was Greek military resistance to two Persian invasions that kept it out of the Persian Empire.
There were many Persan-Greek battles. Which one did you have in mind?
yes because it is covered by many mountains and it has a sea around it
Thermopylai was not a Spartan-Persian battle. It was part of the Persian invasion of peninsular Greece lasting two years involving many Greek cities. The Spartan force at Thermopylai was 300 warriors out of a Greek force of about 8,000. The two-year invasion included several sea and land battles in which Sparta provided some of the Greek naval forces and land forces totalling a couple of hundred thousand. Those battles were Artemesion, Salamis, Plataia and Mykale.
Greece's mainland is generally quite close to the sea, with many areas being just a few miles from the coastline. The distance varies depending on the specific location, but in some places, the mainland can be as little as 2 to 10 miles from the nearest sea. Due to its mountainous terrain and numerous peninsulas, much of the mainland is easily accessible to the coast.