Midnight Marsh lies in the shadow of Nightfall Labyrinth even during the daytime, making the swamplands dark and cool. Scattered ponds are found throughout the marshland and thick brown mud is everywhere underfoot. While this is a popular fishing spot, at nightfall, it is said that shadows escape the dark of Nightfall Labyrinth and Eternity Forest to drink in the moonlight.
TM36 Sludge Bomb can be seen on a small rock poking out of the marsh. It can be reached using Surf.