green group · The short answer
RIVER FEATURES
Each puzzle word passes the same exact test. The four mappings show how the answer works.
A river DELTA is low land formed from deposited sediment where a river divides near its outlet.
A DRAINAGE BASIN is the land area from which precipitation flows toward one stream or connected set of streams.
A river's MOUTH is the place where its water flows into another river, a lake, a sea or an ocean.
A STREAM BED is the ground forming the bottom of a channel occupied, or formerly occupied, by flowing water.
Why this group was difficult
- DELTA has an especially visible competing reading
DELTA can call a Greek letter to mind, which is conspicuous on a board that also contains a hidden-letter category. - The features operate at different geographic scales
A DRAINAGE BASIN can cover a broad area, while a MOUTH or STREAM BED may feel like a more localized physical part. - MOUTH begins with its everyday body meaning
The anatomical sense is likely to appear before the geographic sense, making the river reading less immediate.
How to spot this pattern next time
When one word has a conspicuous second meaning, compare it with the board's more specific terms. DRAINAGE BASIN and STREAM BED strongly establish a river context.
Allow a feature group to include related items at different scales. The rule does not require all four entries to be visually similar parts of one river.
Four useful facts behind the group
- A DELTA forms through the accumulation of sediment near an outlet.
- A DRAINAGE BASIN collects runoff toward connected waterways.
- A river MOUTH is defined by where the river discharges its water.
- A STREAM BED may remain identifiable even when water is absent.
Questions players ask
The details people search after seeing the group
What connects DELTA, DRAINAGE BASIN, MOUTH and STREAM BED?
They are all named features or geographic components associated with rivers and their surrounding systems.
How is a DRAINAGE BASIN a river feature?
It is the entire land area whose precipitation and runoff drain toward a particular stream or connected river system.
What does MOUTH mean in river geography?
It is the outlet where a river enters another body of water, such as a lake, sea, ocean or larger river.
Why is DELTA not used as a Greek letter here?
The three accompanying entries fix the intended reading: DELTA is the sediment-built landform associated with a river outlet.