Thailand Is on the Gulf of Thailand, Not the Open Pacific

Thailand does not have a coastline on the open Pacific Ocean. Its shores face two marginal seas of the Pacific:

• Gulf of Thailand (South China Sea) — East coast of peninsula, Bangkok, Pattaya, Ko Samui, Ko Phangan, Ko Tao. ~320,000 km². Shallow (mean 45 m, max 85 m). Low salinity near river mouths (Chao Phraya, Mae Klong, Bang Pakong).
• Andaman Sea (Indian Ocean marginal sea) — West coast (Phuket, Krabi, Ko Phi Phi, Similans, Surin). Deeper (mean 870 m, max 3,777 m). Clearer water, coral reefs, 2004 tsunami impact zone.

Why the Confusion?

• Both are marginal seas of the Pacific in broad oceanographic classification (South China Sea → Pacific; Andaman → Indian Ocean, but connected via Malacca Strait).
• Tourism marketing: "Pacific" sounds exotic; "Gulf of Thailand" sounds regional.
• Plate tectonics: Thailand sits on the Sunda Plate, bounded by Pacific (Philippine Sea) and Indian Ocean plates—but its coasts are on marginal seas.

Strategic Implication

Thailand's Kra Canal concept (cutting the isthmus) would connect Gulf of Thailand directly to Andaman Sea—bypassing Malacca Strait. Still a Pacific-Indian Ocean shortcut, not open Pacific access.

Thailand is a two-coast nation on marginal seas. The open Pacific is 1,000+ km east (Philippine Sea), beyond the Philippines.