Located on the range of Deo Ca Pass, at the coordinate of 12055’ Degree North and 109023’32” Degree East.
Da Bia Mountain’s elevation is 706 metres, belonging to the southern part of Tuy hoa district, on its east is Hon Ba Mountain which is close to the sea, its western foot is on National Highway 1A, to the north it links with Dong Son Mountain, its southern foot faces Vung Ro Bay. Another name of Da Bia Mountain is Thach Bi Son, there is a legend connecting to this mountain’s name: After defeating Cha Ban Citadel, in the second year of Hong Duc King (1471) , Le Thanh Ton King ordered his soldiers to cross Cu Mong Pass and on the way heading to Deo Ca Pass, the King made his stop here, on this occasion he had a writing carved on the rock as a tombstone.
Being grateful to the King, Phu Yen people built his Temple in Long Xuyen hamlet (now An Dan commune, Tuy An district). In 1881, the 34th year of Tu Duc King, Phu Yen provincial Governor Dinh Nho Quang wrote this couplet hanging in the Temple:
“In opening new lands , our fathers acknowledged Hong Duc King’s contribution
In memorizing that land, his reputation is still there on Thach Bi Son Mountain”
Da Bia is the highest mountain in the area of Deo Ca Pass. In the early morning or late afternoon it is usually surrounded by clouds, sometimes appear and sometimes disappear. At present, Phu Yen province has invested in building a 2,2 kilometres – long road for walking to the top of the mountain. On its top, tourists can enjoy the whole view of Vung Ro Bay, Deo Ca Pass, the Bien Ho Lake (Hoa Xuan Nam commune);Bai Bang Beach, Bai Goc Beach (Hoa Tam commune) and will be more unwilling to part this place when knowing that Da Bia Mountain has many a time witnessed the ups and downs of the country’s history.