Gulfs are large bodies of water that penetrate inland from a larger body of water like an ocean or sea. Gulfs can vary in size, shape, and depth but are generally larger and more deeply indented than bays. Many important trading centers are located on gulfs due to their sheltered harbors. The document then provides examples of several major gulfs around the world, including the Persian Gulf between Iran and the Arabian Peninsula, the Gulf of Mexico between the US and Mexico, and the Gulf of Thailand between Cambodia, Thailand and Vietnam. Gulfs can provide benefits like important shipping channels, tourist destinations, and profitable fishing grounds.