How to implement cascading deletion not only from junction table in Laravel?

Question

Laravel

Hello, tell me please, I have a model Region and Image, a many-to-many relationship is defined between them. Accordingly, in the database of the table: regions, images, and the linking table image_region.
Link table migration here:

Schema::create('image_region', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->unsignedBigInteger('region_id');
            $table->foreign('region_id')->references('id')->on('regions')->onDelete('cascade');
            $table->unsignedBigInteger('image_id');
            $table->foreign('image_id')->references('id')->on('images')->onDelete('cascade');
        });

Actually, the problem I have is that when I delete a Region, the pictures attached to it in the Image table remain, but of course, the id mappings are deleted from the image_region. I would like that when deleting a Region, the pictures from the Image table attached to it and the id mappings from the image_region table are deleted. I have an idea, of course, when deleting a Region, get the images from the Image attached to the corresponding Region and delete them. But maybe there is another solution. Please advise, thanks in advance for your reply.