Saek is a language spoken in several villages in Laos, and in at least three villages in Nakhon Phanom province in northeast Thailand, just across the Mekong river.

Two of these villages are "Ban Asamat" and "Ban Phai Lom," located just off the main river road a few kilometers north of Nakhon Phanom city. Another is Ban Ba Wa Saek, located further upriver, but inland a few kilometers. However, except for the older generation, the Saek language is all but disappearing as there is a strong tendency for younger generations to use the local trade language Lao-Isan, and/or the official Central Thai language as they are assimilated into mainstream Thai society.

source: cross-cultural missionary who surveyed and worked among minority language groups (including Saek) in Nakhon Panom and surrounding provinces since 1974.