Chapters with multiple zones are listed by the highest level.
Note that Olberic's chapter 2 does not have an associated dungeon.
Zones marked with * make good exp grinding zones.

15 The Whistlewood
15 Untouched Sanctum
15 Path of Beasts
18 Tressa Ch2
20 Whistling Cavern
20 Twin Falls
20 Carrion Caves
21 Primrose Ch2
22 Therion Ch2
23 Ophilia Ch2
24 Alfyn Ch2
24 Cyrus Ch2
25 Hoarfrost Grotto
25 The Hollow Throne
25* Tomb of Kings
27 H'aanit Ch2
-- Olberic Ch2
30 Farshore
30 Derelict Mine
32 Olberic Ch3
32 Alfyn Ch3
34 Tressa Ch3
35 Tomb of the Imperator
35 Captains' Bane
36 Therion Ch3
38 H'aanit Ch3
38 Ophilia Ch3
40 Primrose Ch3
40 Cyrus Ch3
40 Quicksand Caves
45* Maw of the Ice Dragon
45 Undertow Cove
45 Moldering Ruins
46 Therion Ch4
46 Ophilia Ch4
46 Tressa Ch4
46 Primrose Ch4
46 H'aanit Ch4
46 Olberic Ch4
46 Alfyn Ch4
46 Cyrus Ch4
48 Forest of No Return
50 Shrine of the Starseer
50 Loch of the Lost King
50 Shrine of the Runeblade
50 Marsalim Catacombs
50 Refuge Ruins
50 Shrine of the Warbringer
50 Dragonsong Fane
50 Shrine of the Archmagus
55 Everhold Tunnels
58* Forest of Purgation