The term 'stretch of river' refers to a section of a river, usually a long one, that is distinct from other sections. It is often used to describe a particular area of a river that has unique characteristics, such as a particular type of vegetation or a certain depth. The term can also be used to refer to a specific part of a river that is used for recreational activities, such as fishing or boating. The crossword solution for this term is 'REACH, ' which is a synonym for stretch.