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River Basin
- the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet; "flood control in the Missouri basin"
- the entire geographical area drained by a river and its tributaries; "flood control in the Missouri basin"
Retention Basin
- a storage site similar to a detention basin but the water in storage is permanently obstructed from flowing downstream
Rotten Borough
- an English parliamentary constituency with few electors
- an English parliamentary constituency with few electors
Residential District
- a district where people live; occupied primarily by private residences
- a district where people live; occupied primarily by private residences
Residential Area
- a district where people live; occupied primarily by private residences
- a district where people live; occupied primarily by private residences
Retirement Community
- a planned community for residents who have retired from an active working life
Retirement Complex
- a planned community for residents who have retired from an active working life
Red-Light District
- a district with many brothels
- a district with many brothels
Rubbish Dump
- a piece of land where waste materials are dumped
- a piece of land where waste materials are dumped
Rustbelt
- urban areas in New England and Midwest characterized by concentrations of declining industries (steel or textiles)