Bahrain is renowned for its verdant groves of date palms; since ancient times it has been an entrepôt for trade and a source of natural resources for the surrounding area. Bahrain Island is widely believed to be the site of the ancient kingdom of Dilmun, a commercial center that traded with ancient Summer. Bahrain's island location has made it unique among Persian Gulf states. With greater access to ocean travel and broader exposure to outside influences, Bahrain traditionally has been home to a more ethnically and religiously diverse and cosmopolitan population than have other, more insular gulf states.