Wajxaklajun (pronounced [waχʃaklaˈχun]) (also known as Ystapalapán, Yolk'u, El Calvario, Carvao and Curvao) is a ruin of the ancient Maya civilization situated adjacent to the modern town of San Mateo Ixtatán, in the Huehuetenango Department of Guatemala.

Wajxaklajun is considered to be the most important archaeological site in the San Mateo Ixtatán area.

[6] Alternative names for the site include Yolk'u (meaning "in the sun") and El Calvario, sometimes contracted to Carvao,[1] or Curvao.

[8] Wajxaklajun is situated upon a ridge in the Cuchumatanes range,[9] at an altitude of 2,540 metres (8,330 ft), immediately to the east of the town of San Mateo Ixtatán,[1] within the Huehuetenango Department of Guatemala.

The Chuj are believed to have traded salt from the local springs with the Tojolabal Maya in return for cacao.

Several range structures are situated upon the northeastern portion of the ridge, and upon the elevation, with a view across the valley to nearby salt springs.

The slope occupying the southwestern portion of the site was modified with the construction of five stepped platforms, in a similar manner to that of Mesoamerican pyramids.

[11] Building 10 stands approximately 35 metres (115 ft) southeast of Mound G, separated from it by a flat expanse.

[18] It lay between Mounds E and H.[13] The archeological site is endangered by the urban growth of San Mateo Ixtatán, with the building of new homes taking place on top of the ruins.

The demand for land for building is such that the municipal authorities lack the incentive to protect the pre-Columbian remains.

[19] The local Chuj Maya inhabitants of San Mateo Ixtatán consider the ruins to have been built by their ancestors, who were either killed by the Spanish invaders or fled to the hills.

The modern Chuj regard the ruins as a sacred place, and it is still the focus of traditional festivities.

[20] Tojolabal inhabitants of Chiapas carry out pilgrimages to Wajxaklajun in order to perform ceremonies.