With the recent changes to D2R area levels I thought I would try to aggregate as much reliable information on all area/monster levels, boss pack counts, and super unique monsters into one easily searchable post with some additional information I found across wiki pages and other user's findings that might help a few newcomers. There's tons of other charts with way more information out there but I thought I'd at least type it out here. It is fairly difficult to track down unique counts on hell difficulty areas which don't have MLvl85 as it's not really a good use of time to be MFing those areas. So forgive me for any areas with the placeholder "count" there and any incorrect numbers. I will try to edit in the info as I find it. If anyone knows where I could find this info feel free to PM me so I can add it in. For now all that's readily available are the 85 areas and I've taken some liberties with areas by inputting numbers for unique packs counts on hell difficulty that I've noticed through my time playing and my own testing which is forever on-going.

May 8th Edit: Completed the Monster Experience aggregate/guide someone was curious about and you can find it HERE.

Key
MLvl= Monster Level
ALvl= Area Level
*=Super Unique Quest Boss
TC=Treasure class

There is a lot of info regarding TC out there and I'll just give you the important bits for farming. TC87 is what allows all item types to drop. Realistically you can farm outside of ALvl85 and still acquire good drops. But because not everything in the zone has TC87 it's not very wise to spend your time searching for specific monsters and based on this info you'll see why people farm ALvl 85. With the info below you can reference the ALvl of areas and farm areas outside ALvl85 if you'd like.
Low chance TC87:

• Regulars in ALvl83
  
• Champions in ALvl80-81
  
• Minions in ALvl80
  
• Bosses in ALvl79-80
  
• Hell Bovines
  
• superuniques: Sharptooth Slayer, Dac Farren, Nihlathak
  
• Baal

High chance TC87:

• Regulars in Alvl84-85
  
• Champions in ALvl82-85
  
• Minions in ALvl81-85
  
• Bosses in ALvl81-85
  
• superuniques: Pindleskin, Frozenstein, Snapchip Schatter, Thresh Socket

Super unique monsters are the named monsters that always spawn in the same place in every game. Like Blood Raven* being in Burial Grounds. She's a super unique. Super uniques have Mlvls of their own for each difficulty.

Each monster pack has a static 6% chance to spawn as a boss pack and a linear scale thats based on the % of map explored. 1/3 of the map segments explored is a 33% chance, half of the map is 50% chance, and 3/4 of the map is a 75% chance for a boss pack to spawn. Unique Monsters are created randomly with each new game, and appear in random places as well.

The first type are the Champion/Ghostly/Fanatic/Berserker/Possessed monsters which have the blue names in packs of 2-4. There is a 20% chance that the boss pack can spawn as a pack of Champs. Champ packs are worth 300% of their base monster experience with the Berserkers being worth 500%. Every group will have 1 "Champion MonsterType" and the remaining 1-3 will independently roll which of the 5 types they are. Can be spawned from activating an Evil Urn, or when activating a Monster Shrine. There are 8 areas where a champion pack always spawns: Tristram, the entrance to Frozen River, the entrance to the Drifter Cavern, the entrance to Ancient's Way, the entrance to Icey Cellar, inside Icey Cellar, and the end of the 4 paths in Halls of Vaught. These monsters have an MLvl of ALvl+2 except Berserkers which are ALvl+3.

The second type are Unique monsters. Their names are randomly generated from a pool of words, appear in gold and always have 3-6 minions of the same monster type except the Fallen/Fetish/Overseer Shamans which have Fallen/Fetish/Overseer minions. They have the other 80% chance to spawn opposed to Champions. These monsters and their minions are worth 500% of the base monster experience. Can be spawned from activating an Evil Urn, or when activating a Monster Shrine. These monsters and their minions have an MLvl of ALvl+3.

Bolded/colored areas are main areas and the nonbold will be a dungeon located in the bold area above. Green color means changed ALvl from the 2.4 patch.

Layout will look like: Area Name|Norm Alvl|NM Alvl|Hell Alvl|Min-Max Boss monster packs|Super Unique Monster[MLvl for all 3 difficulties]


Act 1

• Blood Moor|1|36|67|0(in normal) and 2-4|None
  Den of Evil|1|36|79|0(in normal) and 2-4|Corpsefire[4|39|82]
  
• Cold Plains|2|36|68|4-6|Bishibosh[5|39|71]
  The Cave Level 1 |2|36|77|4-6|Coldcrow[7|39|80]
  The Cave Level 2 |2|37|78|2-3|None
  
• Burial Grounds|3|36|80|0|Blood Raven*[10|43|88]
  Crypt|3|37|83|4-5|Bonebreaker[5|40|86]
  Mausoleum|3|37|85|4-5|None
  
• Stony Field|4|37|68|4-6|Rakanishu[8|40|71]
  Tristram|6|39|76|2-3(including set champ pack)|Griswold[5|39|84]
  
• Dark Wood|5|38|68|4-6|Treehead Woodfist[5|38|69]
  Underground Passage Level 1 |4|37|69|4-6|None
  Underground Passage Level 2 |4|38|85|2-3|None
  
• Black Marsh|6|38|69|6-8|None
  The Hole Level 1 |5|38|80|4-6|None
  The Hole Level 2 |5|39|81|2-3|None
  Town Cellar Level 1 |7|38|75|2-4|None
  Town Cellar Level 2 |7|39|76|2-4|None
  Town Cellar Level 3 |7|40|77|2-4|None
  Town Cellar Level 4 |7|41|78|2-4|None
  Town Cellar Level 5 |7|42|79|2-3|The Countess*[11|45|82]
  
• Tamoe Highland|8|39|69|6-8|None
  The Pit Level 1|7|39|85|6-8|None
  The Pit Level 2|7|40|85|2-3|None
  
• Monastery Gate|8|40|70|0|None
  
• Outer Cloister|9|41|70|1-2|None
  
• Barracks|9|40|70|6-8|The Smith*[13|43|73]
  Jail Level 1 |10|41|71|2-3|None
  Jail Level 2 |10|41|71|3-5|Pitspawn Fouldog[14|44|74]
  Jail Level 3 |10|41|71|3-5|None
  
• Inner Cloister|10|41|72|1-2|None
  
• Cathedral|11|42|72|1-2|Bone Ash[17|45|75]
  Catacombs Level 1 |11|42|72|4-6|None
  Catacombs Level 2 |11|42|73|4-6|None
  Catacombs Level 3 |12|43|73|4-6|None
  Catacombs Level 4 |12|43|73|1-2|Andariel*[12|49|75]
  
• Secret Cow Level|28|64|81|4-6|The Cow King[31|67|84]

Act 2

• Sewers Level 1 |13|43|74|3-5|None
  Sewers Level 2 |13|43|74|3-5|None
  Sewers Level 3 |14|44|75|6-8|Radament*[19|47|78]
  
• Rocky Waste|14|43|75|4-6|None
  Stony Tomb Level 1 |12|44|85|3-5|None
  Stony Tomb Level 2 |12|44|85|4-6|Creeping Feature[18|47|82]
  
• Dry Hills|15|44|76|4-6|None
  Halls of the Dead Level 1 |12|44|79|4-6(needs more testing)|None
  Halls of the Dead Level 2 |13|45|81|2-3|None
  Halls of the Dead Level 3 |13|45|82|2-3|Bloodwitch the Wild[17|48|85]
  
• Far Oasis|16|45|76|4-6|Beetleburst[19|48|79]
  Maggot Lair Level 1 |17|45|84|3-5|None
  Maggot Lair Level 2 |17|45|84|3-5|None
  Maggot Lair Level 3 |17|46|85|3-5|Coldworm the Burrower[14|49|88]
  
• Lost City|17|46|77|4-6|Dark Elder[20|49|80]
  Ancient Tunnels|17|46|85|6-8|None
  
• The Valley of Snakes|18|46|77|0|None
  Claw Viper Temple Level 1 |14|47|82|2-3|None
  Claw Viper Temple Level 2 |14|47|83|0|Fangskin[21|50|86]
  
• Harem Level 2 |13|47|78|0|None
  Palace Cellar Level 1 |13|47|78|3-4|None
  Palace Cellar Level 2 |13|47|78|3-4|None
  Palace Cellar Level 3 |13|48|78|2-3|Fire Eye[21|51|81]
  
• Arcane Sanctuary|14|48|79|6-8|The Summoner*[18|55|80]
  
• Canyon of Magi|16|48|79|5-6|None
  
• Tal Rasha's Tombs|17|49|80|4-6(each tomb)|Ancient Kaa the Soulless(spawns in 1 of the false tombs only)[23|52|83]
  Tal Rasha's Chamber|17|49|80|0|Duriel*[22|55|88]

Act 3

• Spider Forest|21|49|79|8-10|None
  Spider Cavern|21|50|79|4-5|Sszark the Burning[25|53|82]
  Arachnid Lair|21|50|85|4-5|None
  
• Great Marsh|21|50|80|8-10|None
  
• Flayer Jungle|22|50|80|8-10|None
  Flayer Dungeon Level 1 |22|51|81|1-2|None
  Flayer Dungeon Level 2 |22|51|82|1-2|None
  Flayer Dungeon Level 3 |22|51|83|1-2|Witch Doctor Endugu[27|54|86]
  Swampy Pit Level 1 |21|51|85|5-6|None
  Swampy Pit Level 2 |21|51|85|5-6|None
  Swampy Pit Level 3 |21|51|85|2-3|None
  
• Lower Kurast|22|52|80|4-5|Stormtree(found at entrance from flayer jungle)[26|53|83]
  
• Kurast Bazaar|22|52|81|4-5|None
  Disused Fane|23|53|85|2|None
  Ruined Temple|23|53|85|2|Battlemaid Sarina[26|56|87]
  Sewers Level 1 |23|52|85|6-7|Icehawk Riftwing[25|55|87]
  Sewers Level 2 |24|53|85|1-2|None
  
• Upper Kurast|23|52|81|5-6|None
  Forgotten Reliquary|243|53|85|2|None
  Forgotten Temple|24|54|85|2|None
  
• Kurast Causeway|24|53|81|0-1|None
  Disused Reliquary|24|54|85|2|None
  Ruined Fane|24|54|85|2|None
  
• Travincal|24|54|82|1-2|Ismail Vilehand*[28|57|85] Geleb Flamefinger*[28|57|85] Toorc Icefist*[28|57|85]
  Durance of Hate Level 1 |25|55|83|2-3|None
  Durance of Hate Level 2 |25|55|83|2-3|None
  Durance of Hate Level 3 |25|55|83|1-2|Wyand Voidbringer[28|57|86] Maffer Dragonhand[28|58|86] Bremm Sparkfist[28|58|86] Mephisto*[26|59|87]

Act 4

• Outer Steppes|26|56|82|5-6|None
  
• Plains of Despair|26|56|83|5-6|Izual*[29|60|86]
  
• City of the Damned|27/57/84|5-6|None
  River of Flame|27|57|85|6-7|Hephasto the Armorer*[28|60|88]
  Chaos Sanctuary|28|58|85|6-7|Grand Vizier of Chaos*[33|61|88] Lord De Seis*[33|61|88] Infector of Souls*[33|61|88] Diablo*[40|62|94]

Act 5

• Nihlathak's Temple|32|63|83|0|Pindleskin[45|66|86]
  Halls of Anguish|33|63|83|2-4|None
  Halls of Pain|34|64|84|2-4|None
  Halls of Vaught|36|64|84|2-4|Nihlathak*[68|73|95]
  
• Bloody Foothills|24|58|80|5-6|Dac Farren[37|61|83] Shenk the Overseer*[36|61|83]
  
• Frigid Highlands|25|59|81|6-8|Eldritch the Rectifier[34|62|84] Sharptooth Slayer(found near prisoner pens)[39|62|84] Eyeback the Unleashed[35|62|84]
  Abaddon|39|60|85|3-4|None
  
• Arreat Plateau|26|60|81|6-8|Thresh Socket[41|63|84]
  Pit of Acheron|39|61|85|3-4|None
  
• Crystalline Passage|29|61|82|6-7|None
  Frozen River|29|61|83|3-4|Frozenstein(only SU to have varying minion number)[46|64|86]
  
• Glacial Trail|29|61|83|6-7|Bonesaw Breaker[36|64|86]
  Drifter Cavern|29|61|85|6-8|None
  
• Frozen Tundra|27|60|81|6-8|None
  Infernal Pit|39|62|85|3-4|None
  
• The Ancient's Way|29|62|82|6-8|None
  Icy Cellar|29|62|85|6-8|Snapchip Shatter[40|65|86]
  
• Arreat Summit|37|68|87|0|Talic the Defender*[40|71|90] Madawc the Guardian*[40|71|90] Korlic the Protector*[40|71|90]
  
• The Worldstone Keep Level 1 |39|65|85|6-8|None
  The Worldstone Keep Level 2 |40|65|85|6-8|None
  The Worldstone Keep Level 3 |42|66|85|6-8|None
  
• Throne of Destruction|43|66|85|4-5|Colenzo the Annihilator*[43|69|88] Achmel the Cursed*[43|69|88] Bartuc the Bloody*[43|69|88] Ventar the Unholy*[42|69|88] Lister the Tormentor*[58|69|88]
  Worldstone Chamber|43|66|85|0|Baal*[60|75|99]

I hope this helps break the monotonous nature of MFing by convincing a couple people to try a few new zones.

This post was edited by CrackerSJ on Jun 14 2022 02:51pm

quality post = 10/10

Thank you. Still doing some unique pack testing.
Is there anything you think that would've made this a "better" guide?

Anyone made use of this yet?

Great summary thanks!

chaos sanctuary best mf place by far lol

Depends. What you want is monster density and most amount of monsters possible. Especially unique packs. Chaos can be underwhelming at times outside min/max unique pack counts. A3 has some decent density, easily farmable monsters in the flayers/fetishes, and elite pack counts. Also Nihlathak's whole area is one of my favorites. Found plenty of HRs there and there's only 2 spots on each floor where a super chest spawns. WSK is also amazing. I love chaos but it gets very mundane very quickly.

isn't it set to have like 6-7 packs?

also hrs don't really drop connected to the area level. I found jah in den of evil...

Theyre tangentially related to area level. Rune drops are connected to treasure classes. Which is why I included TC87 and possible area levels/monsters associated with that TC so people could farm areas outside level 85s.
Did you read my guide? Because I have elite pack counts for every area in the game listed.

This post was edited by CrackerSJ on May 3 2022 04:55pm

there's nothing to read, really. it looks nice, but cs is the best area by far. lol.