Zunil is an impact crater near the Cerberus Fossae on Mars, with a diameter of 10.26 kilometres (6.38 miles).

If similar impacts also produced comparable amounts of secondaries, this calls into question the accuracy of crater counting as a dating technique for geologically young Martian surface features.

[6][7] A simulation of the Zunil impact ejected on the order of ten billion rock fragments greater than 10 centimetres (3.9 in) in diameter, the total ejecta comprising 30 km3 (7.2 cu mi).

These formed about a billion secondary craters 10 m in size up to 3,500 km (2,200 mi) away from the primary impact.

[6] Research published in the journal Icarus has found pits in Zunil Crater that are caused by hot ejecta falling on ground containing ice.