The Old Swamp first appeared in Monster Hunter. It is a large swamp with numerous caves and a very wet landscape. Dense fog can make visibility low in some areas. In other areas, the ground is too mushy to lay down pitfall traps.
The numerous caves, while freezing, hold large clusters of beautiful crystals. In the North-Western areas, the rolling thunder of a distant storm can be heard. The Old Swamp is teeming with insect nodes, as well as numerous plant and mushroom gathering spots. In most areas of this environment a blue tinge is visible in the sky and fog.
A small area with a Bed and the two item boxes. There's a small river with a Fishing Spot behind the Resting Bed.
No Monsters can appear here.
A tiny area with many gathering spots and two bug nodes, the Veggie Elder wanders this area, rarely, the Purple Gypceros may come here in the G-rank quest "Old Swamp, Shrouded with Mist" and sometimes both Purple Gypceros will come, which makes fighting impossible due to the very small space.
No Monsters can appear here.
A small forested area that is frequently filled with Herbivores such as Kelbi and Aptonoth, there are several herb and a bug gathering points here.
A large grassy field. This area is shrouded in a dense fog, which can inhibit visibility, there are two bug nodes in this area, one large node covering almost the whole area, and another one by a tree in the top right corner, the inhabitants can vary from grazing herbivores to packs of preys, sometimes large Wyverns come to this area.
A medium-sized clearing in the forest. Some stray trees grow throughout the clearing, the fog can be pretty thick here, various types of minions can be found here, and large wyverns come here frequently.
A rounded, sunken, swampy area with three entrances. There is dim fog in this area, this area is usually packed with various types of preys, and the boss monsters that inhabit this area come here constantly, the ground here is too soggy to lay a pitfall trap.
A medium-sized, sunken marsh area. There is no fog here, and usually lots of preys, numerous plants and mushrooms line the rim of the area, the ground here is very moist with lots of puddles, and will not permit pitfall traps to be set.
A small cave with bright pink crystals in it. The crystals can be mined for normal mining materials, There is a fishing area in the small pond of this cave, the cold, damp cave air requires that hunters drink a Hot Drink to stay warm, the area is usually filled with Vespoids and Hornetaurs. Khezu like to hang out in here. Terra Shogun Ceanataur rests here when weakened, sometimes, Basarios also resides here. This is the only area Basarios can go to in the Old Swamp.
A weird, doughnut-shaped cave. There are large red and green crystal formations here, the crystals can be mined in two locations, the floor is damp, and the air is cold. Bring a Hot Drink, Vespoid, Hornetaur, and Khezu like to live here.
A small area that looks like a clearing in the forest, it is commonly inhabited by Bullfango, there is a pile of junk on the Western wall where hunters can retrieve items that have been stolen by Melynx.
A large, open bog with big puddles of water, plants and mushrooms line the perimeter, numerous preys roam the area, and larger wyverns pass through often, the damp, muddy ground will not allow pitfall traps to be set.
A medium-sized cave. In the back, are bright blue crystals which can be mined, Mushrooms can be found growing in here, Insects such as Vespoids and Hornetaur fill the area. Khezu like to come here to rest, the cold air in here can be negated by a Hot Drink.
Accessed only in High and G-rank quests, it consists of a large semi-circle cave with pink crystals that can be mined, there is a rubble pile and barrels that can be gathered, the cold air requires a Hot Drink, you can exit to Areas 7 or 11 depending where you exit from.
If a hunter sneaks up on a Gypceros in zone 10, it can occasionally be observed drinking water from one of the larger puddles.
Sometimes hunters will find large Bullfango in the cave areas. These giant boars have more health and deal slightly more damage than their smaller counterparts. However, they are not considered Bulldromes.
It is possible to hide behind trees and in bushes in areas 1, 2 and 3 to avoid monsters from spotting you.