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# Simulation Settings

There are three files that control the settings for a simulation run:

* [**object.cnt**](/io-docs/introduction-1/simulation-settings/object.cnt.md) specifies the land area and the total area (including ponds and reservoirs) of the watershed and the counts of all spatial objects in a simulation,
* [**time.sim**](/io-docs/introduction-1/simulation-settings/time.sim.md) controls the simulation time period and time step, and
* [**print.prt**](/io-docs/introduction-1/simulation-settings/print.prt.md) controls which output files will be printed for a simulation.

An additional, optional file, [**object.prt**](/io-docs/introduction-1/simulation-settings/object.prt.md), allows the user to print selected output for individual spatial objects.


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