The Malysia Marshes lie just beyond Route 4, and are full of peaceful creatures. However, this area is incredibly large, and you can sometimes get stuck in mud. Nearby are some cliffs, and even a few fishing spots.

Pokemon:
Yanma (Uncommon)
Lotad (Common)
Wooper (Uncommon)
Bidoof (Common)

Areas of Interest: Cladswerf Cliff, Diving Area