What type of geographic landform is mainland Greece as a whole?

Mainland Greece is predominantly characterized by a mountainous landform, with about 80% of its terrain consisting of mountains and hills. The country features the Pindus mountain range, which runs through the center of the mainland, creating a rugged landscape. Additionally, Greece has numerous valleys and plains, particularly in regions like Thessaly, which are surrounded by mountains. The coastline is also highly indented, contributing to the formation of numerous peninsulas and bays.