Mix the flour and salt in a medium bowl. Using a wooden spoon, slowly stir in 2 cups warm water until a dough forms. Lightly flour a clean board, then turn the dough out onto it and knead until smooth, about 10 minutes. Transfer to a clean bowl and cover with a damp kitchen towel; let rest 20 minutes.
Preheat a griddle over medium-high heat. Divide the dough into 8 balls. Using a rolling pin, roll out the balls on a floured board into rough 7-by-8-inch rectangles, about inch thick. Working in batches, cook the dough on the hot griddle until marked on the bottom, 1 to 2 minutes. Flip and grill until marked on the other side. Stack the flatbreads and cover with a kitchen towel up to 20 minutes before serving.