The geography of ancient Greece shaped Greek life. Greece is a peninsula surrounded by water on three sides, with a second peninsula called the Peloponnesus connected to the rest of Greece by an isthmus. Most of Greece's land was mountainous and unsuitable for farming, forcing many Greeks to establish colonies elsewhere or rely on the sea for trade and food. The earliest Greek civilization, the Mycenaeans, started around 2000 BC in the Peloponnesus and featured gold jewelry, bronze weapons, and fine pottery.