Great Rann of Kutch

The Great Rann of Kutch is a vast low-lying salt marsh north of Kutch. Seasonal floods spread across its flat surface, leaving a white crust as the water evaporates. The Rann could be crossed in the dry season, but changing channels and salt water made it a difficult frontier between Kutch and Sindh. In 1819 a great earthquake raised a long ridge known as the Allah Bund, altering drainage and creating a natural barrier across the western Rann.