Preheat the oven to 400°F (200°C).
In a large bowl, mix together the flour, salt, and yeast.
Add in the olive oil and water and mix until a soft dough forms.
Turn the dough out onto a lightly floured surface and knead for about 5 minutes.
Roll out the dough into a rectangle and transfer it to a greased baking tray.
Spread the tomatoes and basil leaves over the top and sprinkle with garlic, oregano, and olive oil.
Bake for 25-30 minutes or until the focaccia is golden brown.
Let the focaccia cool slightly before cutting and serving.