Si Wichian Subdistrict is an official administrative tambon of Nam Yuen District in Ubon Ratchathani, Thailand. Its official Thai name is สีวิเชียร and its six-digit administrative code is 340907.

Sources: OCHA COD-AB Thailand (Royal Thai Survey Department source), reconciled to current DOPA codes
Last reviewed: 15 September 2026
Content owner: Thailand Navigator Editorial Lead
Page type: Subdistrict guide

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