That Logue (Oceana pronunciation: /t̪ʰat̪ 'logɔ/ or /t̪ʰat̪ 'lɒ:(g)/) is a broad, but shallow river and canyon in the northern part of the Lovian state of Oceana. The river has its source high in the Emerald Highlands, just across the Oceana-Sylvania state border and then flows southeast in an almost straight line. At its end, it joins another canyon river, the Northern Trench, to form the Thatrensh river, that eventually passes That Pitte and forms the main stem of Barstow River. That Logue cuts through one of the largest geologic massives of Oceana and its river separates the southern Lawrence French Massive from the northern Massive of the Kings.
That Logue is the steepest canyon of Oceana; especially the southern part is a very hostile area for exploring. This, combined with its unaccessibility and bad underground make it one of the most isolated, undeveloped, and unvisited areas of Lovia.
That Logue flows through one of the most barren regions of Lovia. Due to the rocky underground, trees are sparse and scattered across the landscape. The only types of trees that can survive the nutricient-poor underground are the Stubborn birch (Betula inat) and Oceana pine (Pinus sylvestris var. oceana). Other vegetation that is common in the direct surroundings of the river are mosses, ferns, lichens, and shrubs.
The valley through which That Logue flows is a transitional valley that is steep and V-shaped at the top, but broad and U-shaped at the bottom. Theories on the origin of this distinctive shape vary, but geologists agree that hydrology has been an important factor in the shaping of the valley, and continues to be so. There are some extreme glacial hypotheses on the U-shaped bottom of the valley. One of the most controversial theories holds that the valley was originally a very large river that got covered by a glacier. There are however no signs that glaciers have ever existed in this region.
A more commonly accepted theory is that the valley was way deeper originally and was carved out of the rock formation by a small but fast river. Later on, due to geographic changes in the higher regions, the river brought with it more sediment, that settled in the lower course. Samples of the river bed confirm that its main composition is river sand, but detailed studies of the deeper underground have not yet been performed.