Bataan Foundation Day, observed in the Philippine province of Bataan, is celebrated every January 11 to commemorate the province's founding anniversary. Established on January 11, 1757, by Governor General Pedro Manuel Arandia, Bataan was formed from territories of Pampanga and the corregimiento of Mariveles. The province is notable for its historical significance during World War II, being one of the last strongholds against Japanese forces, leading to the infamous Bataan Death March. Today, Bataan has developed into a major industrial center, housing various industries and over 10,000 micro, small, and medium enterprises. Additionally, it is a popular tourist destination, featuring landmarks such as the Bataan National Park and the Ocean Adventure marine zoological park. The day serves as a reminder of the province's rich history and contributions to the Philippines.