INTRODUCTION

The Great Wall of China is a series of fortifications made of stone, brick, wood, and other materials, generally built along east-to-west line across the historical northern borders of China to protect the Chinese states and empires againt the invasions of nomadic groups of the "Eusasian Steppe".

The Great Wall of China it finds in China. It's 21.196 km long

Other purposes of the Great Wall have included border controls, allowing the imposition of duties on goods transported along the Silk Road, regulation or encouragement of trade and the control of immigration and emigration.