What constellation is the river _ which constellations belong to extragalactic galaxies?

What constellation is Nanhe? Explain as follows.

Betelgeuse in Nanhe is an ancient constellation, also known as the "Lord of the Stars". This constellation consists of eight stars, namely Nanhe, Chen Dou, Niulang, Tiantu, Tianhou, Scorpio, Tianma and Guti. Among them, Guti is the biggest star, which is located in the center and symbolizes the unity of other stars. This river refers to the Milky Way. In the northeast and southeast of Tokyo, there are two famous constellations, named "North River" and "South River", which are regarded as guardians of the Milky Way by the ancients. If anything changes, the world will suffer.