Which one of the following pairs of Island and Sea/Ocean is NOT correctly matched ?

The Chagos Archipelago is not located in the North Pacific Ocean; it is situated in the central Indian Ocean [2]. It forms the British Indian Ocean Territory and includes the strategically significant island of Diego Garcia [2]. In contrast, the other pairs are correctly matched: Cyprus is an island country in the Mediterranean Sea, the Falkland Islands (also known as Islas Malvinas) are located in the South Atlantic Ocean [4], and the Cocos (Keeling) Islands are an Australian territory located in the Indian Ocean, southwest of Indonesia [1]. The Chagos group is specifically identified as a coral atoll formation within the Indian Ocean alongside the Maldives and Lakshadweep [2]. Therefore, option 3 is the only incorrectly matched pair.

Sources

1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 17: Major Landforms and Cycle of Erosion > Atolls > p. 222
2. [2] https://user.iiasa.ac.at/~marek/fbook/04/geos/io.html
3. [4] https://en.wikipedia.org/wiki/Chagos_Archipelago