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- GEOGRAPHIC DATABASE
-
- MARIANA TRENCH
- Largest undersea trench in the world,
- the Mariana Trench approaches 10,000
- meters depth in places. Connected with
- Japan and Kuril Trenches; provides good
- north-south passage for undersea vessels
- between Sea of Okhotsk and Banda Sea N.
- Australia. Low-level surveillance
- activity in this region makes tracking
- difficult.
-