When we think of the great walls of history, we picture the stone fortifications of China or the concrete division of Berlin. Yet, one of the most massive and oppressive barriers ever constructed by an empire was entirely biological, and it has been almost completely erased from modern memory. In the 19th century, the British East India Company desperately needed to enforce its draconian salt tax—a levy that starved the local population but funded the colonial regime. To stop smugglers, British administrators planted the Inland Customs Line: a monstrous, impenetrable hedge of thorny acacia and plum bushes stretching over 2,000 miles across the Indian subcontinent. Guarded by thousands of soldiers, this living barrier was essentially a botanical border wall designed solely to extract maximum wealth from basic human necessity. This book unearths the bizarre logistics and immense cruelty behind the Great Hedge of India. It explores the intersection of botany, bureaucratic obsession, and colonial exploitation, revealing how a simple line of vegetation controlled the economy of millions. Look beyond the military battles of the British Empire. Uncover the terrifying efficiency of colonial bureaucracy and the massive, living scar it once left across the face of India.