Circular View of Ubal Harbour, on the North Part of the Island Bunwoot, near Maguindanao. at Low Water.

Scarce map of Maguindanao a province in the southern Philippine island located in the Bangsamoro Autonomous Region. Forrest had sailed on 9 December in the Tartar, a garay boat of about ten tones from Sulu, Indonesia, with two English officers and a crew of eighteen Malays. Accompanied during part of the time by two small boats, he pushed his explorations as far as Geelvink Bay in New Guinea, explored the Sulu Archipelago, the south coast of Mindanao, Mandiolo, Batchian, and Waigeo, of which his was the first good chart. Forrest reached Dorei Harbour, and returned to Achin (Aceh) in March 1776.

From, Forrest’s, A Voyage to New Guinea, and the Moluccas, from Balambangan including an Account of Magindano, Sooloo, and other Islands performed in the Tartar Galley, belonging to the Honourable East India Company, During the Years 1774, 1775, and 1776 to which is added, a Vocabulary of the Magindano Tongue.