The minor district (King Amphoe) Wan Yai was created on September 16 1977, when the tambon Wan Yai, Pong Kham and Bang Sai Noi were split off from Mukdahan district.1 In 1982 it was one of 6 districts which formed the new province Mukdahan. The minor district was upgraded to a full district on May 9 1992.2
Administration
The district is subdivided into 5 subdistricts (tambon), which are further subdivided into 44 villages (muban). There are no municipal (thesaban) areas, and 4 Tambon administrative organization (TAO).