Cam Luong Sacred Fish Stream

A clear stream about 150 meters long flows out of a mountain, and almost every stretch of it is full of fish. They swim in thick shoals, one shoal after another, right along the bank and beside the footpath. They even pass the feet of people standing at the edge, and they do not flee. The people who live nearby call them the sacred fish.

This is the Cẩm Lương Sacred Fish Stream, in Thanh Hóa. It lies in Ngọc village, at the foot of Trường Sinh Mountain. A 2025 tourism source from Thanh Hóa places it in Cẩm Tú commune. Many older records name Cẩm Lương commune in the Cẩm Thủy area instead.

The Nhân Dân newspaper says the Ngọc stream begins deep inside that mountain range. It flows out through a cave mouth called Bồ Um Cave. Its water is karst water, which means it runs through the rock of a limestone mountain. The fish that live in it are called cá Dốc, and they belong to the carp family. A provincial council record says the shoal lives naturally within the stream, and that local people call it sacred. That name is a folk and spiritual way of speaking, not a scientific one.

Why the fish stay in this short stretch, why they do not swim farther, and why they have no fear of people: no full scientific explanation has been confirmed for any of it. That mystery is part of what makes the place feel strange and draws visitors.

The local people also tell a story. Long ago, they say, an old married couple found an unusual egg beside the stream. It hatched into a snake. As the snake grew, it brought the villagers gentle rain and good weather, and it fought a water monster to protect them. After it died, it was given the title Tứ Phủ Long Vương. The villagers built the Ngọc temple to honor it, and the shoal of fish appeared in the Ngọc stream in front of the temple. This is a folk legend linked to the worship of the Mother Goddesses of Three Realms, a traditional Vietnamese belief. It is not an event with a date that anyone has verified.

That belief has given the fish very effective protection. Because the fish are sacred, nobody catches them and nobody harms them. Over many generations the shoal has not been fished, and the stream has not been disturbed. This is one reason the fish are still so many, and so unafraid of visitors, today. It is a pleasing example of folk belief and the protection of nature pointing in the same direction.

Near the fish stream, on Trường Sinh Mountain, is Cây Đăng Cave. It is a limestone cave with dripstone formations that took thousands of years to grow, one mineral drop at a time. It sits just above the head of the stream and offers another view of the same mountain.

The area is also linked to the Khai Hạ festival, held on the eighth and ninth days of the first lunar month every year. It is tied to the legend of the fish stream and to the story of how the local Mường people founded their villages and communities. The Mường are an ethnic group of northern Vietnam whose language is closely related to Vietnamese.

The stream is not remarkable for its size or its buildings. What counts here is a strange piece of nature, an old local belief, and a balance between people and their surroundings that has lasted across generations. A visitor comes for the fish and finds a way of living, a story, and a kind of protection that needs no sign.