Prepare the vegetables: In a large salad bowl, combine the sliced cucumber, halved cherry tomatoes, and sliced red onion.
Add the olives and feta: Toss in the Kalamata olives, green olives, and cubed feta cheese.
Season and add herbs: Sprinkle the chopped fresh parsley and dried oregano over the salad. Season with salt and pepper to taste.
Make the dressing: In a small bowl, whisk together the olive oil and red wine vinegar until well combined.
Dress the salad: Pour the dressing over the salad and gently toss to coat all the ingredients evenly.
Serve: Serve the salad immediately as a light meal or side dish. Enjoy the fresh, vibrant flavors!