diff --git a/swash/processing/bathy.py b/swash/processing/bathy.py
index 1574817..b21118a 100644
--- a/swash/processing/bathy.py
+++ b/swash/processing/bathy.py
@@ -65,6 +65,7 @@ log.info(
 if config.has_section("out"):
     out = pathlib.Path(config.get("out", "root"))
     log.info(f"Writing output data to '{out}'")
+    out.mkdir(exist_ok=True)
     np.savetxt(out.joinpath("bathy.dat"), bathy.z, newline=" ")
     np.savetxt(out.joinpath("hstru.dat"), bathy.hstru, newline=" ")
     np.savetxt(out.joinpath("poro.dat"), bathy.poro, newline=" ")