An around 20-kilometre-long river is captured still flowing in temperatures of less than -40C at northern China's A'ershan National Forest Park on November 22.

The pretty video shows the river flowing as usual with steam rising up when everything else around it is frozen and covered in snow.

Cows were drinking water from the unfrozen river and tourists can be seen rafting down the river as well.

Since the river is located on the volcanic lava area, the geotherm means the river is too warm to freeze.

内蒙古阿尔山有一条很神奇的一条河，它就是位于阿尔山国家森林公园内的不冻河。
不冻河全长约20公里，是哈拉哈河上游的一段河流，一年四季畅流自然，她之所以不结冻的原因，是由于她地处火山熔岩分布区，河段附近有大量地热存在的缘故。

　　蒙蒙白雾从河面升腾、飘舞，两岸苍松挂满白珊瑚样的晶莹霜花，三九严寒，滴水成冰，阿尔山市境内所有大河小溪皆封冻，唯有该河段水中还长着青青的水草，牛羊漫步河中，悠然吃草，犹如世外仙境。所以这里又被当地人称为“水中草场”。

　　或许你在夏天体验过漂流的那种激情与凉爽，但你绝对没有感受和体验过阿尔山不冻河冬季漂流，因为阿尔山不冻河漂流，是国内唯一的冬季漂流体验项目。阿尔山的冬天，周围环境处于-40℃以下的气温，唯有此段河水热气腾腾，流水淙淙，令人称奇。在朦胧雾气中穿行，与风儿相伴，看沿岸冰晶玲珑，宛如仙境，一切皆是随心而行，让您体验到冬天漂流的梦幻之感。

Music from https://filmmusic.io
"Clear Waters" by Kevin MacLeod (https://incompetech.com)
License: CC BY (http://creativecommons.org/licenses/by/4.0/)