isNaturalWatercourse

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: isNaturalWatercourse

Indicates that one entity is a naturally formed flowing body of water (such as a river or stream), rather than an artificial or man-made channel.