Where in Thailand are Lao-related dialects spoken?

In Thailand, dialects related to the Lao language are primarily spoken on the Khorat Plateau in the northeastern region of the country, near the border with Laos.1

This region, officially designated as Isan, is home to the majority of these speakers, who often refer to themselves as Khon Isan. While these dialects are linguistically very similar to the Lao spoken across the Mekong River, the distinction between them is considered more political than linguistic. It is important to note that not all populations in the northeast speak these Lao-related dialects; for instance, the Thai Khorat people in the southwestern province of Nakhon Ratchasima speak dialects more closely related to central Thai, and other groups in the southernmost part of the region speak languages related to Cambodian traditions.23