Ton Yuan (ต้นยวน) is a subdistrict of Phanom in Surat Thani. Khao Na Nai Luang Dharma Park is a notable local religious site: the provincial tourism office describes its pagoda on a limestone hill and its role as a place of meditation.
Official education-quality records identify community centres at Ban Khao Na Nai, Ban Tham Phueng and Ban Pa Tong within Ton Yuan, showing the broader village setting beyond the hilltop site. The tambon is an administrative destination; a visit to the monastery should use its own entrance and respectful visiting arrangements.
