Preheat the oven to 450 degrees F (230 degrees C).
Cut carrots on an extreme bias into long 3/8-inch-thick slices. Arrange in a 9x13-inch baking dish. Add orange juice, water, coriander, and salt and pepper; toss to coat.
Roast until tender, 30 to 35 minutes, turning halfway through roasting time and drizzling with 1 tablespoon melted butter (and adding additional water if juices begin to scorch).
Meanwhile, stir together bread crumbs, remaining 1 tablespoon melted butter, orange zest, and garlic in a small bowl. Sprinkle over carrots; roast until panko is lightly browned, about 5 minutes more. Garnish with chopped parsley leaves.