Wat Koh Klang is located west of Lamphun along Highway 1156 which follows the Ping River along the border with Chiang Mai province. A number of individual ruins make up the site, each afforded an information board to help identify it within or near the compound.

The site is described as having Mon origins built by In Ta the father of Princess Chamathewi. Little more is known about it except that in lay abandoned for a long time until some renovation work was carried out in 1971 when the ruins were registered and the components identified. These consist of the following: -
1) Chedi Mai Ta – Located near the Ping River, a probable crossing point, the chedi is constructed in Lanna/Burmese style.
2) Mondrop in the Water – A chedi on a round base about 2.3 metres tall. Excavations revealed pieces of pottery from the Lanna kilns together with over 2,000 pieces of stucco sculpture similar to those at Wat Chedi Yot in Chiang Mai built by King Tilokarat which dates it to 14th/15th Century.
3) Principal Chedi – Located in the main compound, consisting of a castle style chedi on a square base on which the tower was built with niches on all four sides supporting a spire. It appears to have been built long before Hariphunchai was incorporated into the Lanna Kingdom in the 14th Century. Some renovation work seems to have been carried out in the 15th/16th Century.
4) Vihran Phra Non – Only the bases exist of two buildings only a metre apart on top of which was built a new viharn. The ruined image of the Buddha was found nearby which would have been in a reclining position, hence the name ‘Phra Non’.
5) Ubosot of Ko Klang Temple – The base here is rectangular stucco and brick. In the corners there are traces of decorative stucco posts suggesting the ubosot was made of wood except for the rear wall behind the Buddha image which was in brick. Boundary stones were found in eight positions around the base suggesting the boundary was changed probably around the new Buddhist era 15th Century.
6) Mondrop Chedi – This chedi comprises two square bases one on top of and overlapping each other supporting a chedi with niches in the four sides. A semicircle of brick on the roof suggests it was the base of a bell-shaped chedi similar to the one at Wat Maha Photharam in Chiang Mai. This would date it as 15th Century.

Today there are monks in residence after the Department of Buddhism built a new temple on site in 1978.