sourceBasin

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: sourceBasin

Indicates that one entity is the drainage basin or watershed from which another entity (such as a river segment or water body) originates or receives its source waters.