The Bahrain pearling trail is a 3.5 km trail located in the island of Muharraq, in Bahrain, that was used by pearl divers during much of Bahrain's history until the early 1930s, when the pearl market in Bahrain crashed as a result of the introduction of cultured pearls from Japan. Pearling in Bahrain has occurred since 2000 BC. The pathway consists of 17 buildings in Murharraq, 3 oyster beds located in the nearby sea, a segment of the coast and the seafront Bu Mahir fortress in the southern tip of Muharraq. The trail was inscribed as a UNESCO World Heritage Site on June 30, 2012 and is Bahrain's second World Heritage Site after the Bahrain Fort. Pearl diving in Bahrain was first mentioned in Assyrian texts dating to 2000 BC, referring to fish eyes from Dilmun (the ancient name of Bahrain). Bahrain was mentioned by Pliny to have been, famous for the vast number of its pearls.