Pella is one of the regional units of Greece, in the geographic region of Macedonia. It is part of the Region of Central Macedonia. It is named after the ancient city of Pella, the capital of ancient Macedonia and the birthplace of Alexander the Great. The capital of Pella is Edessa with a population of 19,036 inhabitants according to the census of 2011, while the largest city and industrial and commercial center is Giannitsa with 29,789 inhabitants. Other important centers are the towns Krya Vrisi, Aridea and Skidra.