def bounding_box(self):
        """Bounding box (`~regions.BoundingBox`)."""
        xmin = self.center.x - self.radius
        xmax = self.center.x + self.radius
        ymin = self.center.y - self.radius
        ymax = self.center.y + self.radius

        return BoundingBox.from_float(xmin, xmax, ymin, ymax)