River journeys: 30 sourced records

What this topic measures

River lengths vary with the chosen source and channel. This snapshot uses one explicitly stated estimate per connected system. The unit is km. This topic uses ratio scoring: a value half the target and a value twice the target are equally far away, so think in multiplicative bands rather than fixed steps.

A record is a named row in the frozen catalog, not necessarily a unique entity. Some topics contain several records with the same value, and a name round accepts any record at the closest distance. The table below is the complete answer set for this topic; there is no hidden shortlist.

All 30 records

Every row links to the original source used for that record. Values are rounded for display only; the scoring engine uses the stored source value. The snapshot date and unit are part of the topic’s definition, so a current live figure may differ.

The table has 30 rows, one for each accepted record. It does not list every alias or spelling variant; the game’s name matcher handles those at answer time. If two records share a value, both remain separate rows.

The range and the gaps

The 30 records run from 2,945 km to 6,650 km. The median is 3,820.5 km, with a middle half from 3,181.3 km to 4,835 km. The largest adjacent gap is 736 km between Yenisey river system and Mississippi river system. 1 records share a value with another record, so names can be tied even when their values are equal.

The highest listed records are Nile river system (6,650 km), Amazon river system (6,400 km), Yangtze river system (6,300 km). The lowest are Colorado-Green river system (2,945 km), Lower Tunguska river system (2,989 km), Rio Grande river system (3,057 km). Use these as anchors before you make a ratio or year estimate; the table below gives every value.

What the table does not tell you

These are single snapshot values in km for 30 long river systems · first listed conventional estimate. The table is not a time series, a range of typical values or a measure of uncertainty. A source can round, revise or use a different definition in a later release; the game uses the stored snapshot for every score. Read the source and the record label before treating a value as a current live measurement.

How to estimate this topic

River lengths are kilometres for named river systems. Measurement depends on the source’s chosen source and mouth, so two lists can disagree. Use 1,000 km, 3,000 km and 6,000 km bands; the longest records are continental-scale.

For a method that applies across topics, see the estimation guide. To practise this topic without changing a daily result, open the practice setup for River journeys. The setup opens first; it does not start a clock automatically.

Recent daily use

No completed daily flight has used this topic yet. The next flights may include it; the practice setup is available now without changing a daily score.

Practise River journeys →

Source, licence and snapshot

The listed source is Wikipedia contributors · Rivers by length ↗. Snapshot: 2026-10-24. Licence / attribution: CC BY-SA 4.0.

We select and transform source records for independently written game rules. The source material remains subject to its original licence. If a value looks wrong, send the topic, record, expected value and source through the contact form; do not send passwords or account credentials.

Related topics

Mountain heights (8 records) · Lakes from above (30 records) · Animal scales (29 records) · Animal lifespans (31 records)

All 27 topics · Archive · Source attribution