How to explain ACROSS in this sentence?

Hi,

I recently encountered an article about snakehead fish. It says in the article: The main distribution of the snakehead fish is found in the Indo-Pacific area with twenty-five species found from the Amur across China, Indonesia, Burma, western India, Sri Lanka and into the tropical areas of Africa.

Does the bolded part mean that the Amur is stretched from one end of China to the other end OR the Amur area and the areas in China (which are two concepts)?

It means an area that begins at the Amur and extends across all those countries, including the tropical areas of Africa.

Best wishes, Clive

Dr Nick Riviera wrote:

Perhaps you can help by telling us where (and what) the Amur is. Is it a part of China?