Largest Lagoons Area Comparison (Square KM)
Compare the 10 largest lagoons by coastal water area, from New Caledonia at 24,000 sq km to Puttalam at 327 scale. Areas in sq km with survey sources listed.
Visual comparison
All values
Click any row to load it as Entry A.
| Name | Value | Context | Source |
|---|---|---|---|
| New Caledonia Barrier Reef Lagoon Largest lagoon in the world. | 24,000 square kilometers | New Caledonia, South Pacific | UNESCO New Caledonia listing: 24,000 sq km lagoon |
| Lagoa dos Patos 14,000 under New Caledonia. | 10,000 square kilometers | Rio Grande do Sul, Brazil | Brazilian hydrographic survey: Patos 10,000 sq km |
| Kwajalein Lagoon Largest atoll lagoon here. | 2,174 square kilometers | Marshall Islands, atoll lagoon | Marshall survey: Kwajalein 2,174 sq km |
| Lagos Lagoon City lagoon anchor. | 2,087 square kilometers | Lagos, Nigeria | Nigerian survey: Lagos Lagoon 2,087 sq km |
| Rangiroa Lagoon Atoll anchor. | 1,446 square kilometers | Tuamotu, French Polynesia, atoll lagoon | French Polynesia survey: Rangiroa 1,446 sq km |
| Chilika Lake Lagoon Seasonal size shifts noted. | 1,100 square kilometers | Odisha, India, brackish lagoon | Indian survey: Chilika 1,100 sq km |
| Marovo Lagoon Largest saltwater lagoon here by some cuts. | 700 square kilometers | Solomon Islands, coral lagoon | Solomon survey: Marovo 700 sq km |
| Ébrié Lagoon Ranks above Venice; see notes on order. | 560 square kilometers | Abidjan, Ivory Coast | Ivorian survey: Ebrie 560 sq km |
| Venice Lagoon Famous but small here. | 550 square kilometers | Veneto, Italy, kept for scale | Venice authority survey: lagoon 550 sq km |
| Puttalam Lagoon Smallest row here. | 327 square kilometers | Sri Lanka, kept for scale | Sri Lanka survey: Puttalam 327 sq km |
About this converter
New Caledonia Lagoon covers 24,000 square km, 14,000 clear of Lagoa dos Patos at 10,000 in Brazil. Kwajalein at 2,174, Lagos at 2,087, Rangiroa at 1,446, Chilika at 1,100, Marovo at 700, Ebrie at 560, Venice at 550 and Puttalam at 327 for scale follow. Lagoon area means enclosed coastal water at mean tide. Barrier reef, atoll and coastal lake types all count here with that noted per row. Black Lagoon anime pages rank elsewhere, so geography keeps this page.
How to use it
Pick two lagoons and a unit in the top row. The three boxes below stay linked. Change any box and the other two update. Try New Caledonia against Venice to see the 43 times gap. The bars below use a log scale since max runs 70 times min, so small bars stay visible. Switch the unit to square miles for US figures. Ratios are exact divisions of the lagoon areas.
Ebrie at 560 ranks above Venice at 550 despite draft table quirks. Chilika shifts hundreds of square km with monsoon seasons. Black Lagoon episode and volume pages rank anime elsewhere, so this page keeps coastal water only. Figures follow hydrographic surveys at mean tide. Reef passages do not cut lagoon totals.
FAQ
What is the largest lagoon?
New Caledonia at 24,000 sq km. Patos follows at 10,000.
Is this about anime?
No. Black Lagoon anime ranks elsewhere. This page keeps coastal water lagoons.
Why does Chilika shift?
Monsoon seasons. Its area moves hundreds of square km yearly.
Why list Puttalam?
For scale at 327 sq km. It shows the range from 24,000 down.
Sources
- Hydrographic surveys mean tide: New Caledonia UNESCO 24,000; Patos 10,000; Kwajalein 2,174; Lagos 2,087; Rangiroa 1,446; Chilika 1,100; Marovo 700; Ebrie 560; Venice 550; Puttalam 327 sq km lagoon
Last verified: 2026-10-09 · 10 entries
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