Lake of Nur
Lake Nur is found by traveling through the Old Forest.
The first level is devoid of enemies and has a fixed layout. Most of the level is water, with a shore on the north and a few islands scattered around the lake. Near the south end of the map is a building which contains the stairs to the next level.
The second and third levels have dungeon layouts like that of Kor'Pul and Dreadfell. The second level is flooded with water and contains aquatic creatures such as water imps and squid. The third level is usually clear of water and is inhabited by horror-type enemies and a few wilderness enemies appropriate to the Old Forest. Neither level is consistently lit.
1/11 of the water squares on level 2 will have air bubbles in them; spending a turn in a bubble will increase air by 18, but eventually destroy the air bubble. It is therefore possible to traverse Lake Nur 2 without water breathing, though it is much easier to make the trip with it.
The downstairs from Lake Nur 3 lead to the Sher'Tul Fortress.
As of version 1.0.3, Lake Nur has an alternate layout, in which both the second and third levels are underwater.