The term 'Tagalog' may have been derived from the word "taga-ilog" or "river dwellers" referring to the Pasig River located further up north of the region. However, Wang Teh-Ming in his writings on Sino-Filipino relations points out that Batangas was the real center of the Tagalog tribe, which he then identified as "Ma-yi" or "Ma-i". According to the Chinese Imperial Annals, Ma-yi had its center in the province and extends to as far as Cavite, Laguna, Rizal, Quezon, Bataan, Bulacan, Mindoro, Marinduque, Nueva Ecija, some parts of Zambales, and Tarlac. However, many historians interchangeably use the term Tagalog and Batangueño.