In a large bowl, mix whole wheat flour, salt, and yeast.
Gradually pour lukewarm water while kneading the dough.
Cover the dough with plastic wrap and let it ferment for 1 hour.
Place the dough on the work surface and gently fold it by hand.
Let the dough ferment for an additional hour.
Shape the dough into a ciabatta form and let it rest for 20 minutes.
Preheat the oven to 230°C (446°F).
Bake the dough in the oven for 20 minutes.