Distance from Singapore to the Open Ocean

Singapore is an island city-state at the southern tip of the Malay Peninsula, strategically positioned between the South China Sea (east) and the Strait of Malacca (west). Both are marginal seas of the Pacific and Indian Oceans, respectively. The "open ocean" (unrestricted deep water beyond continental shelves) is reached:

• Southward: Through the Singapore Strait → Karimata Strait → Java Sea → Makassar Strait → Pacific/Indian Ocean exchange. The southern shore of Pulau Ubin (off Singapore's northeast coast) is ~0.5 km from the main island, but still within the Singapore Strait.
• Westward: Through the Strait of Malacca (800 km long, min width 2.8 km) → Andaman Sea → Indian Ocean.

Singapore has no coastline directly on the open ocean; its waters are entirely within enclosed/semi-enclosed seas. The nearest true open-ocean point is south of the Natuna Islands (South China Sea) or west of Sumatra (Indian Ocean), several hundred kilometers away.