Jezero (crater)

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Jezero crater is a about 45-kilometer-wide bowl on Mars in the Syrtis Major region. Scientists think it used to be filled with water and to have a lake inside. A fan-shaped delta and clay-rich sediments sit at the crater, showing where rivers carried sediment into the lake. The delta, along with old river channels, indicates long-lasting water and a real chance for life to begin.

The name Jezero comes from a town in Bosnia and Herzegovina; in some Slavic languages, jezero means lake.

In 2018 NASA chose Jezero as the landing site for the Mars 2020 mission and the Perseverance rover. Perseverance landed there on February 18, 2021, at a spot later named Octavia E. Butler Landing. The main goal is to search for signs of ancient life and to collect rock and soil samples for possible return to Earth.

Since landing, Perseverance has found clues about the lake’s history. Boulder falls were seen on the delta walls. In the nearby Séítah region, scientists found igneous rocks with a cumulate texture—olivine crystals embedded in pyroxene—indicating slow cooling magma. The rocks also show minerals that formed in water, like carbonate and sulfate, evidence that the lake interacted with water. The PIXL instrument studied rocks in detail, and scientists observed daily weather changes, including dust devils.

In 2022 the rover detected organic molecules in Jezero. Some rocks in an area called South Séítah also show signs that could point to past life, though other explanations are possible. In 2024–25 scientists reported possible biosignatures in certain rocks, but more work is needed to confirm any life. Clays found by orbiters, especially smectite, support the idea that water once existed here, and drying patterns in the clay reveal past environmental changes.

There are plans to return samples from Jezero to Earth in the future, using Perseverance to collect them and a follow-up mission to bring the specimens home.

Overall, Jezero tells a story of an ancient lake fed by rivers, with rocks formed by water and magma, and tantalizing hints that life might have had a chance there long ago.