South Natuna ( Indonesian: ''Natuna Selatan'') is an

archipelago An archipelago ( ), sometimes called an island group or island chain, is a chain, cluster, or collection of islands. An archipelago may be in an ocean, a sea, or a smaller body of water. Example archipelagos include the Aegean Islands (the o ...

off the west coast of the island of Borneo, the southernmost group of the

Natuna Islands Natuna Regency is an islands regency located in the northernmost part of the Province of Riau Islands, Indonesia. It contains at least 154 islands, of which 127 of them are reported as uninhabited. This archipelago, with a land area of 1,978.4 ...

in the

South China Sea The South China Sea is a marginal sea of the Western Pacific Ocean. It is bounded in the north by South China, in the west by the Indochinese Peninsula, in the east by the islands of Taiwan island, Taiwan and northwestern Philippines (mainly Luz ...

. Geographically it is part of the Tudjuh Archipelago, and administratively part of the Riau Islands Province of

Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania, between the Indian Ocean, Indian and Pacific Ocean, Pacific oceans. Comprising over List of islands of Indonesia, 17,000 islands, including Sumatra, ...

. The archipelago is spread out over hundreds of kilometers. Major islands include Greater Subi Island (Pulau Subi Besar), Lesser Subi Island (Pulau Subi Kecil), Bakau, Panjang, Midai and Serasan. The Api Passage separates the South Natuna group from the island of Borneo. The Selasan Strait cuts through the bottom of the cluster of islands. Kepala Island is the easternmost island of Riau Islands Province.

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