borderRiverContext

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: borderRiverContext

Indicates that a river serves as or is involved in forming the boundary between two geographic or political regions within a specific contextual setting.