Q5: In which ocean would you chart the deep‑sea trench named for Java, aligned with a subduction zone that shapes an Indonesian island arc?​

• Hint: This trench marks a boundary where one plate dives beneath another, birthing volcanoes, generating seismicity, and sculpting basins along a vast equatorial basin.​
  The name points squarely at maritime Southeast Asia, but the correct basin is the key to sorting it from nearby seas and gulfs on the map.​
  Oceanographers classify this feature among the great trenches that rim the world’s tectonic fire belts, but its label ties it to a single island.​