Helské jezero, Egalské jazero, Egalsko jezero, Egalíe Eźíora, Ehalsko Ezero
|River sources||Banuy, Borava, Bráh, Banava, Livna, Rumina, Ćeklonma, Ciześca, Nela, Riíoźa, Ikŝa|
|Basin countries|| Chira|
|Max. length||528 km|
|Max. width||210 km|
|Surface area||32519.5 km2|
|Average depth||49 m|
|Max. depth||168 m|
|Water volume||1600 km3|
|Residence time||~15 years|
|Surface elevation||98 m|
|Max. temperature||20 °C|
|Min. temperature||2 °C|
|Frozen||~ every 70 years|
|Major cities||Ćiśka, Jankovar, Nikolovac, Jurva, Horve, Kolin, Mociaprot, Odrava, Poltavy, Śisa, Vendra,|
|Major ports||Drabantský Kolín, Jankovar, Kolin, Mociaprot, Nikolovac, Odrava|
The Egalian Lake (Drabantian: Helské jezero, Mallyorian / Zalivnian: Egalsko jezero / Егалско језеро, Litvanian: Egalské jazero, Meciaran: Egalisk Lak, Shomi: Egalíe Eźíora, Podolian: Ehalsko Ezero or Ehalsko more , in Ingerish alternatively also Egailian Lake) is a large freshwater lake in Central Uletha. Eight nations have access to the shores of the lake, more than for any other inland body of water in the world. Those nations are Chira, Drabantia, Escadia, Litvania, Mallyore, Meciara, the Podolian Republic and Zalivnia.
The Egalian lake and the region surrounded it, commonly known as Egalia, are one of the most prominent features in Ulethan continent. All countries lying on the shores of it are landlocked, therefore the waters of the lake play key role in trade and international cooperation between the countries with combined population of more than 40 million people. On the other hand, the concerns and worries of water pollution are always on the agenda. Almost all Egalian nations have powerful industry and developed agriculture, which both rely either the Egalian waters or the rivers of its basin.
Roughly 250 rivers, big and small, run into the lake. The outflow is the river Ina, spanning through Podolia, Chira, UL109 and Surian republic of Lido. It creates natural water international highway, connecting Great Rift Sound and Egalian Lake.
Acheologic fossils and found items evidence that the first settlers of the region were Uletarephian tribes migrating from the west, possibly due to constant expanding of Mazan desert from the south. The most ancient of those are about 2300 years (3 century B.C.). Those proto-Uletarephians have not yet been divided into subgroups we know today by that time (or at least not completely divided): proto-Slevic and proto-Kalmish groups are thought to be separated as late as 1 century A.D.
Common and straightforward version that "Egalia" is originated from standard Kalmish egal (ing. equal or the same) is now accepted as inconsistent. The first main reason for that is because it is a relatively recent borrowing from Romantian, and second one is that it gives no answer at all how the word appeared and transformed in languages of other, predominantely Slevic peoples on the shore of the lake. And, most importantly, we have no evidences ever existing a Slevic equivalent for the word, which certainly must happed if the word "Egalia" has purely only Kalmish origin.
The theory suggested and developed by archeologists and linguists in 1880s claims the word "Egalia" (and thus, Egalian lake) is originated from proto-Uletarephian word *ǵʰel- meaning to glow, to shine and therefore the name probably means "The shining / the glowing lake" which is quite sensible, concerning huge clean water surface that outgoes horizon and reflects daylight. 
HydrographyBorava, Banuy, Banava, Rumina, Ćeklonma, Ciześca, Livna, Riíoźa, and Ikŝa.
The lake waters flow into Great Rift Sound through the river Ina. This is one of the biggest rivers of Uletha with the length of 703 km and navigable throughout its all distance, providing Egalian nations with access to the World Ocean.
The surface area of the lake is 32,519.50 km2, making it one of the largest freshwater lakes in the world. The average depth is estimated at 49 m, while the deepest point reaches 168 below the surface or 70 below World Ocean level. The surface has an elevation of 98 meters and slightly fluctuates during the year: the highest level is observed in late March, and the lowest in January. The difference between these two can be up to 0.8 m.
Waves can reach up to 7 m in height during storms. Tides are insignificant, the difference between water levels during low tide and high tide is less than 20 cm.
About 79% of the water inflow is due to tributaries, 19% is due to precipitation, and 2% is due to underground waters. Outflow balance is as follows: approximately 71% of water goes away with Ina, 28% - through evaporation, 1% - other factors, including anthropologic ones.  Taking into account that annual streamflow of Ina is 108 km3, the residence time of Egalian lake is estimated at roughly 15 years. It means that all the water of the lake renews 1 time every 15 years.
The lake is stretched in nearly latitudinal direction, i.e. from west to east. Its length reaches as far as 520 kilometers and its average width is 50-60 km in broader parts and 25-30 km in middle parts. Coastline is not much indented and generally Egalian lake has not so much convenient natural harbours. The most noticeable and biggest bays of the lake are located in the north the bay of Kolin, stretching for more than 120 kilometers into the land, and the bay of Shisa at the southern shore.
The biggest island in Egalian Lake is Zatizhitsa (Livnian: Затижица / Zatižica). The Egalian Lake is clearly divided into two uneven parts by it: both the western and the eastern parts are deep and are connected by two shallow straits with maximum depths not exceeding 15 meters. Couple of so-called Middle Straits has been always a strategic place in Egalian aquatory, and the possessing of them means the controlling the trade routes.
Other well-known islands include the Brezník Chain (Litvanian: Breznícké ostrovy), belonging to Litvania.
Several cities and many towns are located on the shore of the lake. Most of them were formed around harbours and used to be maritime trade hubs. Some of them include:
- Śisa, Ćiśka and Kalvadanca, Chira;
- Odrava, Drabantia;
- Varventis, Jurva and Horve, Escadia;
- Kolin and Jankovar, Litvania;
- Nikolovac and Svetivan, Mallyore;
- Mariner and Ehalska Pristan, Podolia.
At the bottom, there are numerous wrecks of ships from historical battles and merchant ships that capsized during storms. The lake is a popular destination for many divers.
Such a big amount of water has the main and most important influence on climate in the region. Shortly speaking, the lake cools the area in summer and warms it in winter, because water masses store significant amount of heat energy during the summer, transferring it to surrounding lands at the winter. This is also the reason why it rarely freezes over. Last time that happened was in 1962 after exceptionally cold winter.
The Egalian Lake also brings moisture and precipitation year-round. Due to its large area, it reacts slowly to temperature changes. Thus, the lake maximum temperature during short continental summer barely reaches 20 °C; the average winter water temperatures are approx. 2-4 °C.
The exact way the lake was formed is unclear, analyses of rocks found on the shore suggest it was formed sometime in the Quarternary. The area used to be covered by a continental glacier back then. The mass of ice eroded and depressed the surface. When the glacier melted, it formed a basin that got filled with water and became a lake.
The bottom of the lake is covered mostly by quartz and granite. These stones can also be found on the shore. Sediments such as shale can be found near the Banuy river mouth. The area isn't very rich in valuable metals (or natural resources in general).
- Podolian word "more" (pronounced ['mɔ:rje]), which literally means "sea", is traditional name among indigenous people for Egalian Lake because of its huge size.
- Regional waterway inflow into the Egailian Lake, Litvanian National Survey Service, 19 July 1947, Kolin, Dobromilá Lučehovecká a Miron Smrček.
- "Complex analysis of water balance of Egalian Lake" Peter Hartley, Mihal Kuznicki 2002 - Mariner Institute of Geography
- List of wrecks on the Egalian lake, www.egaliawrecks.lk Retrieved 12 Jan 2001.
- "Reactions of Seawater in the Egailian Lake to rapid temperature change" Miloš Brozek 12 April 1962 - Loravian Institute of Hydrology and Hydrography of the University of Loravia
- pages 115 - 124, Horninotvorné pochody a procesy naší domoviny, Čermáková Alena and Hrozín Petr, Technické nakladatelství Odrava, 1932
- pages 26 - 42, Glacier Lakes in North-Central Uletha, G. Smrczek, Drabantian Royal Institute for Science, 1902