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This study explores a total of sixteen archaeological sites in the ancient town of Wiang Lo, which can be divided into two types: Chedi (stupa) and Vihara (Buddhist assembly hall). This research suggests that firstly one of unique characteristics of Chedi in the Ink basis is exemplified by that of Wat Lom That. With an octagonal plan, the Chedi has its base up to the bell part made out of brick masonry, whose pedestal shows unique feature of zig-zag brick pattern. The Chedi of Wat Lom That is comparable to that of Ban Roang Hai, Phayao, and that of Wat Pra Keaw, Chiang Kong. Secondly, the characteristics of Vihara in Wiang Lo can be distinguished by their distinct plans: Vihara with an extruding front of one span and Vihara with a rectangular plan. Compared in terms of plan, posts’ position, and roof structure with Vihara or Ordination Hall found in Lampang, Nan and Loungprabang, Vihara in Wiang Lo is indicative of a possible relationship with Vihara of Chaing San and of Eastern Lanna as well as Vihara or Ordination Hall of Tai Lue.