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Pha Mo I Daeng is a sandstone cliff in Khao Phra Wihan National Park rising over 500 meters above the Cambodian lowlands. The expansive views from the top allow visitors to see across both sides of the border.

The cliff contains ancient bas-relief carvings discovered in 1987, reached via a staircase through the rock face. These carved images demonstrate early settlement and use of the site over centuries.

The cliff location serves as the Thai gateway to Prasat Preah Vihear temple ruins, marking a significant boundary between Thai and Cambodian territories.

Access is via highway 221 through Sisaket Province, with marked pathways keeping visitors in permitted areas. The walking routes are well-defined and manageable for most visitors in normal conditions.

The forest surrounding the cliff is home to wild hogs, deer, gibbons, and civets that move freely across both sides of the border regardless of human boundaries. These animals treat the area as a single habitat despite the political division.