# List of largest lakes and seas in the Solar System

Listed below are the largest ocean, lakes and seas in the Solar System and beyond includes single bodies of water or other liquid on or near the surface of a solid round body (terrestrial planet, planetoid, or moon).
Currently, cold surface bodies of liquid are found on two worlds in the Solar System, Earth and Saturn's moon Titan. Earth is the only planet with liquid water on its surface. The other "oceans" are found under thick covers of surface ice. If both liquid and frozen water are counted, Earth ranks fifth in volume of its oceans. Recent studies indicate a large underground saltwater ocean present on Ganymede, Jupiter’s largest moon, with estimated water volume eight times greater than Earth’s world ocean.
The fourth largest of Jupiter’s moons, Europa, while smaller than Earth’s moon, ranks fourth in water volume, estimated to be twice more than on Earth. Latest analysis using data from NASA’s James Webb Space Telescope indicates that the carbon dioxide found on the icy surface of Europa likely originated in the subsurface ocean which could potentially be habitable.
Scientists predict "oceans" beneath the ice of the Jupiter's moon Callisto cratered surface and the south pole of Saturn's moon Enceladus. Saturn's moon Titan is also thought to have a salty subsurface ocean of water - as salty as the Dead Sea on Earth. Additionally, research suggests that Saturn's moon Mimas might be hiding a liquid water ocean beneath its impact-battered surface. A subsurface ocean at Neptune's moon Triton is considered possible as well. Mysterious fault lines on dwarf planet Pluto may suggest that it has a hidden subsurface ocean.
Lava lakes are found on Earth and Jupiter's moon Io. Subsurface oceans or seas are suspected to exist on some of Saturn's other moons, the asteroid Ceres, the larger trans-Neptunian objects, and ice planets in planetary systems.
Recent analysis of the interior of Ganymede suggests that it and some of the other icy bodies may not have a single interior global ocean but several stacked ones, separated by different phases of ice, with the lowest liquid layer adjacent to the rocky mantle below.
In June 2020, NASA scientists reported that it is likely that exoplanets with oceans may be common in the Milky Way galaxy, based on mathematical modeling studies of their internal heating rates. The majority of such worlds would probably have subsurface oceans, similar to those of the icy moons Europa and Enceladus.

## List

Largest known or predicted oceans, lakes and seas, with composition and dimensions, grouped by celestial body and sortable by size, depth, etc. :
| Body | Type of object | Liquid volume in zettaliters | Ocean/Lake/Sea | Composition | Location | Area (km$^2$) | Average depth (km) | Notes |
| Earth | planet (terrestrial) | 1.362 | World Ocean | salt water | surface, global | 361,300,000 | 3.68 (max 11.02) | commonly divided into five regions 71% of Earth's surface Mass of 1.4 × 10$^{18}$ tonnes |
| Earth | planet (terrestrial) | 1.362 | Caspian Sea | salt water | surface, Central Asia | 389,000 | 0.21 (max 1.02) | Earth's largest inland body of surface liquid, endorheic (0.07% of Earth's surface) |
| Earth | planet (terrestrial) | 1.362 | Lake Michigan–Huron | fresh water | surface, North America | 117,400 | 0.07 (max 0.28) | largest freshwater lake |
| Mars | planet (terrestrial) | ? | south polar lakes? (not confirmed) | salt water or brine? | subglacial, south polar cap | c. 200 | (shallow, > 0.2 m) | there may be additional such lakes |
| Io | moon of Jupiter | ? | Gish Bar Patera | lava | surface | 9,600 | ? | |
| Io | moon of Jupiter | ? | Loki Patera | lava | surface | < 32,000 | ? | |
| Europa | moon of Jupiter | 2.6 | (internal global ocean) | water? water–ammonia mixture? | subsurface, global | c. 30,000,000 | est. 50–100 | global ocean under 10 to 30 km of ice, perhaps twice the volume of Earth's ocean |
| Ganymede | moon of Jupiter | 35.4 | (internal global ocean) | salt water? | subsurface, global | c. 80,000,000 apiece | 100 | 100 km thick, under 150 km of ice, six times the volume of Earth's ocean; possibly three oceans, one under another |
| Callisto | moon of Jupiter | 5.3 | (internal global ocean) | water? water–ammonia mixture? | subsurface, global | c. 65,000,000 | 10 | global ocean under 135 to 150 km of ice |
| Enceladus | moon of Saturn | 0.01 | (internal global ocean) | (salt?) water | subsurface, global | c. 650,000 | 26–31 or 38 ± 4 | global ocean under 21–26 or 23 ± 4 km of ice, based on libration |
| Dione | moon of Saturn | 0.14 | (internal global ocean?) | water? water–ammonia mixture? | subsurface, global | c. 2,700,000 | 65 ± 30 | global ocean under 99 ± 23 km of ice |
| Rhea | moon of Saturn | ? | (internal global ocean?) | water? water–ammonia mixture? | subsurface, global | c. 1,000,000–2,000,000 | c. 15 | possible global ocean under the ice (c. 400 km) |
| Titan | moon of Saturn | 18.6 | Kraken Mare | hydrocarbons | surface, north polar region | ≈ 400,000 (0.5% of Titan's surface) | 0.85 (max) | largest known body of surface liquid beside Earth's Ocean; the northern Moray Sinus bay is the only part measured bathymetrically |
| Titan | moon of Saturn | 18.6 | Ligeia Mare | predominantly methane, with small amounts of ethane and nitrogen | | 126,000 | ~0.2 | |
| Titan | moon of Saturn | 18.6 | Punga Mare | hydrocarbons | surface, north polar region | 61,000 | ~0.11 | |
| Titan | moon of Saturn | 18.6 | (internal global ocean) | water? water–ammonia mixture? | subsurface, global | c. 80,000,000 | < 300 | global ocean of water under < 100 km of ice |
| Titania | moon of Uranus | ? | (internal global ocean?) | water? water–ammonia mixture? | subsurface, global | c. 5,000,000 | c. 15–50 | possible global ocean under the ice (c. 150–200 km) |
| Oberon | moon of Uranus | ? | (internal global ocean?) | water? water–ammonia mixture? | subsurface, global | c. 3,000,000 | c. 15–40 | possible global ocean under the ice (c. 250 km) |
| Triton | moon of Neptune | 0.03 | (internal global ocean, ) | water? water–ammonia mixture? | subsurface, global | c. 20,000,000 | c. 150–200 | likely global ocean under the ice (c. 150–200 km) |
| Pluto | dwarf planet (plutino) | 1 | (internal global ocean) | water? water–ammonia mixture? | subsurface, global | c. 10,000,000–15,000,000 | c. 100–180 | possible global ocean under the ice (c. 150–230 km) |
| Makemake | dwarf planet (cubewano) | ? | (internal global ocean?) | water? water–ammonia mixture? | subsurface, global | c. 3,000,000 | ? | possible global ocean under the ice |
| Gonggong | dwarf planet (SDO) | ? | (internal global ocean?) | water? water–ammonia mixture? | subsurface, global | c. 2,000,000–3,000,000 | ? | possible global ocean under the ice |
| Eris | dwarf planet (SDO) | ? | (internal global ocean?) | water? water–ammonia mixture? | subsurface, global | c. 10,000,000 | c. 150–200 | possible global ocean under the ice (c. 150–250 km) |
| Sedna | dwarf planet (sednoid) | ? | (internal global ocean?) | water? water–ammonia mixture? | subsurface, global | c. 1,000,000 | c. 15 | possible global ocean under the ice (c. 200 km) |