Why Is The Strait Separating Sumatra and Java Named The Sunda Strait?

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Wednesday, September 23, 2026

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UNGKIT.COM – Why is this strait named the Sunda Strait when it separates the islands of Sumatra and Java? Those who do not yet know are likely curious about the answer.

The strait separating Sumatra and Java in Indonesia is named the Sunda Strait because it borders the territory and culture of the Sundanese people in the western part of Java.

The origin of the name "Sunda" refers to the realm of the Sunda Kingdom, which historically encompassed the western part of Java—the very region where these waters are located.

People in the past named the strait after the local community inhabiting the nearest coast: the Sundanese people.

Separating Sumatra and Java

The Sunda Strait is a narrow body of water separating Java to the east and Sumatra to the west, connecting the Java Sea with the Indian Ocean.

Located south of Lampung Province and west of Banten Province, the Sunda Strait is one of two major passages leading from the South China Sea to the Indian Ocean; the other is the Strait of Malacca.

This vital shipping lane is also home to several islands, such as Sebesi, Sebuku, Sangiang, and Panaitan, as well as the Krakatoa archipelago—a cluster of volcanic islands comprising Rakata, Panjang, Sertung, and Anak Krakatau. Now you know! (*)

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