Top 10 largest lakes in the world

Why a sea appears in a lake puzzle

The Caspian Sea is landlocked and is conventionally included in lists of lakes despite its name and salinity. Calling a body of water a sea is not, by itself, a rule for including or excluding it. If the question had asked specifically for freshwater lakes, the candidate pool would change. This is why the title, physical definition and measurement need to be read together. The answers here compare the named water bodies under the original surface-area convention.

Michigan and Huron illustrate a boundary choice

Lake Michigan and Lake Huron are connected through the Straits of Mackinac and can be treated hydrologically as one lake system. The archived puzzle follows the familiar named-lake convention and lists them separately. Combining their surface areas would produce a different first group, rather than a small correction to one row. The same distinction appears in many geography rankings: a connected physical system and its separately named parts are not always the same reporting units.

What area cannot tell you

Lake Baikal is an especially useful reminder that depth and volume need their own comparisons. Its position in a surface-area list does not communicate the scale of its water storage. Surface areas can also change with water levels, seasons and long-term environmental conditions. A number measured in one year should not automatically be compared with a different lake’s current footprint. For replay, this page preserves the 2024 answer order. When checking another reference, establish whether it combines Michigan–Huron, excludes saline lakes or uses a different observation date before deciding that the two rankings disagree on the same question.

Sources & further reading

• Encyclopaedia Britannica: lakes reference
• NOAA: Great Lakes information

Explanation updated Thursday, October 1, 2026. The puzzle’s original data date is listed below.