In a large mixing bowl, combine warm water and yeast. Let it sit for 5–10 minutes until foamy.
Add flour and salt. Stir with a spoon until a shaggy, sticky dough forms.
Cover the bowl with plastic wrap or a clean towel. Let the dough rise at room temperature for 12–18 hours, until doubled in size and bubbly.
Turn dough out onto a floured surface. Fold it over itself a few times and shape into a round loaf. Let it rest for 30–45 minutes.
While the dough rests, place a Dutch oven (or heavy pot with lid) in the oven and preheat to 450°F (230°C).
Carefully place the dough into the hot Dutch oven. Cover and bake for 30 minutes.
Remove the lid and bake for another 10–15 minutes until the crust is deep golden brown.
Remove the bread and cool on a wire rack for at least 30 minutes before slicing.