2026 Bangsaen21 is a future half marathon and road race listed on the official AIMS member-race calendar for 2026-12-20 in Bang Saen, Chonburi, Thailand. Importance evidence: AIMS official member-race calendar/listing (April 2026–July 2027) verifies future date and race class; December selections prioritize globally recognized city marathons, World Athletics Label-style Asian road races, national-capital/major-city marathons, and high-participation destination race weekends.
Date
Dec 20, 2026
Distance
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Elevation
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Difficulty
n/a