What is incorrect about the capitalization in the sentence describing the Amazon river?

The capitalization in the phrase "Amazon river" is incorrect because proper nouns, such as "Amazon," should always be capitalized in English to indicate their significance. In this case, "Amazon" refers to the specific name of a notable river, while "river" is a common noun that should be lowercase unless it is part of a formal title. Therefore, the correct form would be "Amazon River," with both words capitalized to properly denote that it is a well-known geographical feature.

The other choices involve common nouns or pronouns that do not require capitalization under standard grammar rules in the context provided. "Snake," for instance, is a generic term and does not need to be capitalized unless it is the beginning of a sentence or part of a title. Similarly, "river's edge" uses "river" and "edge" as common nouns, and the pronoun "our" is only capitalized at the beginning of a sentence.