hasHydrologicalBoundary

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: hasHydrologicalBoundary

Indicates that one entity serves as a hydrological boundary or limit for another, typically defining the extent of a water-related area or system.