View source for Areas by CR

== Note ==
The Challenge Ratings are based on the idea that you'll be with a party.

If you're going solo, it's suggested you add 2-3 levels to the CR (in many cases (Areas), you are better off adding 4-5 Levels...depending on your Build, and especially whether or not your Build utilizes Magic (divine/arcane) or UMD (considering how easily dispellable UMD is from Scrolls).

The stated CR of some areas is quite wildly different from the real difficulty.

== Distribution ==
{| style="white-space:pre"
|- style="font-weight:bold"
|Levels
|  Area Count
|-
|00-05
|  20
|-
|05-10
|  18
|-
|10-15
|  16
|-
|15-20
|  15
|-
|20-25
|  15
|-
|25-30
|   6
|}

==  Surface Level 0-5 ==
{| style="white-space:pre"
|- style="font-weight:bold"
|CR
|  Area
|-
|  0.5
|  Soubar Well
|-
|   1
|  Chionthar East, from Outer City -> Wyrms Crossing -turn left before crossing the bridge.
|-
|   1
|  Mausoleum (from Graveyard)
|-
|   1.5
|  BG Outer City, Graveyard
|-
|   2
|  BG North, Bandit Cave
|-
|   2
|  Hilltop Ruins Level 1
|-
|   2,5
|  Mausoleum Floor 2
|-
|   2.5
|  Hilltop Ruins Level 2
|-
|   2.5
|  BG, East Gate Sewers
|-
|   2.5
|  Trade Way, Road south of BG
|-
|   3
|  Boareskyr Bridge, Bear Cave
|-
|   3
|  Gibberling Cave
|-
|   3
|  Chionthar East, Ruins
|-
|   4
|  BG, Palace District Sewers
|-
|   4
|  Cloakwood East
|-
|   4
|  Boareskyr Bridge
|-
|   4,5
|  Underground Ruin (Mausoleum Floor 3, PARTY RECOMMENDED. Lots of offensive spellcasters therein.)
|-
|   5
|  Northern Tradeway, Road south of Soubar
|}

==  Surface Level 6-10 ==
{| style="white-space:pre"
|- style="font-weight:bold"
|CR
|  Area
|-
|   6
|  Lion's Way, Road south of FAI
|-
|   6
|  Northern Tradeway, Ant Burrow
|-
|   6
|  North of Beregost, Road
|-
|   6
|  Cloakwood East, Mine
|-
|   6
|  Ulgoth's Island
|-
|   7
|  North of Beregost, Goblin Mine
|-
|   7
|  Thundar's Ride (CR 8 at night)
|-
|   7
|  Boareskyr Bridge, Bridgefort
|-
|   7
|  Sea Cave Trolls, Next to Candlekeep
|-
|   8
|  North of Beregost, Overgrown Abandoned Chapel
|-
|   8
|  BG, Sewer Bowels
|-
|   8
|  Thundar's Ride, Water Cave
|-
|   8
|  High Hedge
|-
|   8
|  Woods of Sharp Teeth and Orc Cave
|-
|   8
|  Lion's Way, Gnoll Cave
|-
|   8
|  Cloakwood Central
|-
|   9
|  Dragonspear Exterior and Castle
|-
| 10
|  Cloakwood Central, Minotaur Cave
|-
| 10
|  BG, Undercity
|}

== Surface Level 11-15 ==
{| style="white-space:pre"
|- style="font-weight:bold"
|CR
|  Area
|-
| 12
|  Cloakwood Central, Hag Cave
|-
| 12
|  Cloakwood North-West
|-
| 12
|  Chionthar West, Next to Ulgoth's Beard
|-
| 13
|  Uldoon's Trail, North of Nashkel
|-
| 13
|  Cloakwood North-West, Haunted House Level 1
|-
| 13
|  Skuldask's Cave (probably higher)
|-
| 13
|  High Moor Ruins (careful very dangerous)
|-
| 14
|  Cloakwood North-West, Haunted House Level 2
|-
| 14
|  High Moor South
|-
| 14
|  Ulgoth's Island, Crab Cave
|-
| 14
|  Ulgoth's Beard, Pirate Cave
|-
| 14
|  Xvarts
|-
| 14
|  Fields of the Dead
|-
| 15
|  The Troll Claws, Elder Ogre Stronghold
|-
| 15
|  Gullykin, Crypt
|-
| 15
|  South of Beregost, Wyverns
|-
| 15
|  Winding Waters 
|}

== Surface Level 16-20 ==
{| style="white-space:pre"
|- style="font-weight:bold"
|CR
|  Area
|-
| 16
|  Fields of the Dead, Crypt
|-
| 16
|  Troll Claws, Ogre Cave
|-
| 16
|  Corm Orp
|-
| 16
|  Winding Waters Temple
|-
| 16
|  Durlag's Exterior and Tower
|-
| 16
|  Cloud Peaks (Nashkel) Foothills
|-
| 16
|  South of Beregost Mines (formerly Nashkel's Iron Mine); CR increases to 18 one descends the mines.  Boss is CR 21.
|-
| 17
|  Nashkel's Iron Mine Exterior
|-
| 18
|  Troll Claws
|-
| 18
|  Ulcaster Ruins
|-
| 19
|  Durlag's Labyrinth Levels 1-2
|-
| 19
|  Cloud Peaks
|-
| 20
|  Troll Claws, Troll Cave
|-
| 20
|  Ulcaster Shadow Ruins
|-
| 20
|  Yuan-ti Hills
|}

== Surface Level 21-25 ==
{| style="white-space:pre"
|- style="font-weight:bold"
|CR
|  Area
|-
| 21
|  Searing Tunnels and Searing Caverns
|-
| 21
|  Cloakwood North-West, Haunted House Level 3
|-
| 22
|  Crystal Cave (entrance at exterior Naskhel Iron Mines map)
|-
| 22
|  Durlag's Labyrinth Level 3
|-
| 22
|  Durlag's Labyrinth Level 4
|-
| 23
|  Trollclaws, Old Mine
|-
| 23
|  High Moor, Spirit Troll Cave
|-
| 23
|  Wyrm's Cave
|-
| 23
|  Yuan-ti Temple
|-
| 23
|  Reaching Woods
|-
| 23
|  Lizard Cave
|-
| 23–24
|  Elder Ogre Stronghold (Trollclaws)
|-
| 24
|  Stone Giants (not currently accessible)
|-
| 24
|  Cloudpeaks - Lich Cave
|-
| 24
|  The Forsaken Catacombs - First Floor
|-
| 24
|  Forest of Wyrms
|-
| 24–25
|  Reaching Woods, Talis
|-
| 25
|  The Forsaken Catacombs - Second Floor
|}

== Surface Level 26-30 ==
{| style="white-space:pre"
|- style="font-weight:bold"
|CR
|  Area
|-
| 26
|  Ziggurat
|-
| 26+
|  Cliffside Keep (Note: CR increases as you descend interior levels)
|-
| 27
|  Frost Giants Castle
|-
| 28
|  Speartop
|-
| 29–30
|  The Forsaken Catacombs - Third Floor and "Fourth" floor called Depths of the Undying
|-
| 29
|  Netherese Maze
|-
| 30
|  Lyran's Hold
|-
| 30
|  Graypeaks
|}

==  Upper Dark Areas ==
{| style="white-space:pre"
|- style="font-weight:bold"
|CR
|  Area
|-
|  5
|  South of Grottoes
|-
|  6
|  Gauth Grottoes
|-
|   8
|  Abandoned Mines
|-
| 10
|  Titanfist Mines
|-
| 17(?)
|  Blackrock
|}

==  Underdark Level 0-5 ==
{| style="white-space:pre"
|- style="font-weight:bold"
|CR
|  Area
|-
|   1
|  Sewers
|-
|   1
|  Varalla's Passage
|-
|   1
|  Wine Cellar & Herb Garden
|- 
|   1
|  S'samath Tombs
|-
|   2
|  Mushroom Grove
|-
|   3
|  South of Varalla's
|-
|   4
|  West of Varalla's
|-
|   5
|  Goblin Lake
|-
|   5
|  Spore Grove
|}

==  Underdark Level 6-10 ==
{| style="white-space:pre"
|- style="font-weight:bold"
|CR
|  Area
|-
|   7
|  River Rift
|-
|   9
|  Northwest of River
|-
|   9
|  Upper Goblin Cave
|-
|   9
|  Lower Goblin Cave
|-
| 10
|  Southwest of River
|}

==  Underdark Level 11-15 ==
{| style="white-space:pre"
|- style="font-weight:bold"
|CR
|  Area
|-
| 12
|  Tarpits
|-
| 13
|  Blackrock 
|-
| 13
|  Large Crypt 
|-
| 14
|  North of Tarpits
|-
| 14
|  Illithid Mine Cavern
|-
| 14
|  Illithid Mines (IG map states CR 15)
|-
| 15
|  Ophidian Tunnels 
|-
| 15
|  Kro's Labyrinth
|}

==  Underdark Level 16-20 ==
{| style="white-space:pre"
|- style="font-weight:bold"
|CR
|  Area
|-
| 16
|  Illithid Hive (questionable rating, lots of illithids make it considerably harder)
|-
| 16
|  South of Tarpits
|-
| 16
|  Myconid Circles (says CR 17 on IG map)
|-
| 18
|  Kro's Descent
|-
| 20
|  East of Mistlake (questionable rating...more like CR 17)

|}

==  Underdark Level 21-25 ==
{| style="white-space:pre"
|- style="font-weight:bold"
|CR
|  Area
|-
| 21
|  Duergar Compound
|-
| 22
|  Formian Ruins
|-
| 22
|  The Wilds
|-
| 24
|  The Wilds Descent
|-
| 24
|  Lava Cave
|-
| 25
|  Oghrann's Ruins
|-
| ??
|  Illithid Mines (Deep) [Is this even a thing, or is it referring to the Illithid Hive?]

|}

==  Underdark Level 26-30 ==
{| style="white-space:pre"
|- style="font-weight:bold"
|CR
|  Area
|-
| 26
|  North of Mist Lake
|-
| 28
|  Oghrann Great Halls
|-
| 30
|  Netherese Ruins
|}

== And Avernus... ==
Exists too. Not.