Half a border, half a swine, Yet I am neither by design. Prickly coat but soft inside, I curl to a ball when I hide. What am I?

In dirt the seed remains hid. Though I shoot from the ground, I make not a sound. It Can also describe a small kid.

Mountains rise on either side, I stretch below, long and wide. Rivers wander through my floor, what am I at nature’s core?

Oh this is fun, due to it’s nature. A noun and verb, gliding on the use of nomenclature. It looks the same both front and back, From letter sequence, to on the rack. A calming paddle forth and back, To places boats can’t take you.

From a distant star, not near or far, an oddity beyond our ken. With eyes aglow and ways unknown, it visits us now and again.