蘇墨神廟, Hindu temple in Porong, Indonesia.

Candi Sumur is a Hindu temple ruin of red brick in Porong, Sidoarjo, with a square plan of 8 by 8 metres and a height of about 10 metres. Only the floor, the foundation and parts of the eastern and southern walls remain, so the body stands half-split vertically. The walls are plain, without reliefs or carved dates, and the brickwork faces west.

The site dates to the 14th century during the Majapahit Kingdom under Raja Hayam Wuruk's rule. It was built during a period when other important religious structures were also being erected in the region.

The temple was built based on a local story about a vanished relative of Prince Brawijaya. This narrative shapes how visitors today understand and experience the place.

Accessing the temple involves climbing steep brick stairs that are uneven and require careful footing. Wearing sturdy shoes and moving slowly allows you to explore safely and take in the surroundings.

Concrete frames were installed inside the remaining walls to slow deterioration of the eastern and southern sections. This approach shows how modern conservation methods help protect this ancient structure.