String theory provides a natural way of constructing UV complete quantum gravity theories, which form a vast string landscape. Nonetheless, there also exists infinitely many low energy effective field theories that cannot be coupled to a UV complete quantum gravity theory, which form the "swampland". The precise boundary between the landscape and swampland is an important unsolved question. We wish to enlarge the known part of string landscape with new constructions in F/M-theory, and study their statistics. The results can also have indirect applications in beyond standard model physics and potential dark matter candidates.