The landmass of Sulawesi includes four peninsulas: the northern Minahasa Peninsula; the East Peninsula; the South Peninsula; and the Southeast Peninsula. Three gulfs separate these peninsulas: the Gulf of Tomini between the northern Minahasa and East peninsulas; the Tolo Gulf between the East and Southeast peninsulas; and the Bone Gulf between the South and Southeast peninsulas. The Strait of Makassar runs along the western side of the island and separates the island from Borneo.
Sulawesi is the world’s eleventh-largest island, covering an area of 174,600 km² (67,413 sq mi). The central part of the island is ruggedly mountainous, such that the island’s peninsulas have traditionally been remote from each other, with better connections by sea than by road. The three bays that divide Sulawesi’s peninsulas are, from north to south, the Tomini, the Tolo and the Boni. These separate the Minahassa or Northern Peninsula, the East Peninsula, the Southeast Peninsula and the South Peninsula. The Strait of Makassar runs along the western side of the island. The island is surrounded by Borneo to the west, by the Philippines to the north, by Maluku to the east, and by Flores and Timor to the south.
The Selayar Islands make up a peninsula stretching southwards from Southwest Sulawesi into the Flores Sea are administratively part of Sulawesi. The Sangihe Islands and Talaud Islands stretch northward from the northeastern tip of Sulawesi, while Buton Island and its neighbours lie off its southeast peninsula, the Togian Islands are in the Gulf of Tomini, and Peleng Island and Banggai Islands form a cluster between Sulawesi and Maluku. All the above-mentioned islands, and many smaller ones are administratively part of Sulawesi’s six provinces.
Sulawesi is part of Wallacea, meaning that it has a mix of both Indomalayan and Australasian species that reached the island by crossing deep-water oceanic barriers. The flora includes one native eucalypt, E. deglupta. There are 8 national parks on the island, of which 4 are mostly marine. The parks with the largest terrestrial area are Bogani Nani Wartabone with 2,871 km² and Lore Lindu National Park with 2,290 km². Bunaken National Park which protects a rich coral ecosystem has been proposed as an UNESCO World Heritage Site. The island of Sulawesi has six national parks and nineteen nature reserves. In addition, Sulawesi has three marine protected areas. Many of Sulawesi’s parks are threatened by logging, mining, and deforestation for agriculture.
