Japan's East-West Span: ~1,850 Miles (3,000 km)

The straight-line distance from Japan's easternmost point (Minami-Tori-shima / Marcus Island, 153°59′E) to its westernmost point (Yonaguni-jima, 122°56′E) is approximately 1,850 miles (3,000 kilometers).

Context

• Main Islands Only (Hokkaido to Kyushu): ~1,200 miles (1,900 km).
• Including Remote Islands: Ogasawara (Bonin) Islands extend far east; Yaeyama (Yonaguni) far west.
• Latitudinal Span: ~1,900 miles (3,000 km) north-south (Cape Soya to Hateruma).

Implications

• Wide time zone spread (effectively 2 hours solar time) — but whole country uses JST (UTC+9).
• Diverse climates: Subarctic (Hokkaido) to Subtropical (Okinawa).
• EEZ (Exclusive Economic Zone) ~4.5M km² — 6th largest globally.

Japan is much more elongated east-west than commonly perceived on Mercator maps.