The correct answer is Kutch.
Kutch is a region in the northwestern Indian state of Gujarat. It is known for its Ajrakh block printing, which is a traditional textile printing technique that has been practiced in the region for centuries. Ajrakh prints are characterized by their intricate designs and vibrant colors. They are often used to create clothing, home furnishings, and other decorative items.
Saurashtra is another region in Gujarat that is known for its textile production. However, Saurashtra is more famous for its hand-woven textiles, such as patola and bandhani, than for its block printing.
South Gujarat is a region in the southern part of Gujarat that is known for its agricultural production. It is not as well-known for its textile production as other regions of Gujarat.
The Gulf of Khambhat is a gulf in the Arabian Sea that lies between the states of Gujarat and Maharashtra. It is not known for its textile production.
In conclusion, Kutch is the coastal region that is known for its Ajrakh block printing.