The Jacha Fortress is located in Lawongtong Village, Gongya Township, Dege County. It is the site of the Zhongling tribe fortress of the Lingtsang family during the time of King Gesar. The entire site is surrounded by mountains on three sides and bordered by water on the other. The ruins are situated on a hillside along National Highway 317. The site mainly consists of the central fortress ruins at the top of the hill, the remains of subsidiary buildings scattered along the mid-slope and foot of the hill, and the faintly visible remnants of the fortress walls, as well as ancient defensive watchtowers located in the east, west, south, and north.

Gongya Monastery was built on the site of Jacha Fortress and is one of the rare monasteries of the Sakya school that performs the "King Gesar Dance." The fortress, known as "Ochü Chozong" (Castle of the Gathering Waters), was centered in Gongya by Jacha, the eldest brother of King Gesar of Ling. To the east was the Natural Sunlight Castle, to the south the Hanging Bucket Castle, to the west the Beautiful Neck Castle, and to the north the Soaring Eagle Castle. The ruins of these ancient sites are scattered throughout the surrounding area.

The Jacha Fortress was built in the late 11th century. At that time, the ancient Dege region under the Lingtsang domain was divided into three tribal groups: Upper Ling, Middle Ling, and Lower Ling. This unified structure emerged after King Gesar consolidated the previously fragmented tribes. The Gongya region, where the fortress is located, served as the political center of the Middle Ling tribe and was governed by Jacha, the half-brother of King Gesar.

During the Yuan Dynasty, after the central government unified the Tibetan regions, the Lingtsang Tusi family was officially recognized, with Ezhi as their administrative center, overseeing a vast territory in the Kham region. However, by the late Ming and early Qing periods, the power of the Lingtsang family gradually declined due to the growing influence of the Dege Tusi family. As a result, the Lingtsang family's territory significantly shrank and was eventually replaced by the Dege Tusi.

On the mountain peak directly south of Jacha Fortress, there is a sharp cut or dent, which is said to be the path of an arrow shot by General Jacha. On the mountainside, there are ruins of a stupa dedicated to the Five Long-Life Goddesses, protectors of King Gesar. Near the riverbank, this site attracts crowds of worshippers every year on the 15th day of the fifth month in the Tibetan calendar.

Looking southeast from the fortress, at the foot of the mountain, you can see eight scattered mounds of earth. Among them, the largest mound is home to a single towering cypress tree, about 10 meters tall. A tragic yet beautiful legend surrounds this place: it is said that not long after General Jacha passed away, he appeared in a dream to his eldest son, Lhasa Garatsega. In the dream, he revealed that at the foot of the fortress mountain, there were eight stupas, which were manifestations of his soul to help guard the land. Among them, the largest stupa represented his heart, and his soul transformed into a green cypress tree to stay by his son's side forever.