- This category is intended for all waterbodies (i.e. rivers, lakes, canals, marshes, etc.) that form part of the drainage basin of the main river.
- Direct and indirect tributaries are grouped in subcategories, for instance the category [[Category:Prut basin]] contains a subcategory [[Category:Tributaries of the Prut]]. The main river heads the list, for example: [[Category:Prut basin| ]] is added to the article "Prut".
- Other waterbodies are grouped as follows: "0" is used for branches of a delta, old river branches, backwaters, braided streams, anabranches, and rivers that flow directly into sea. "B" is for bogs and swamps, "C" for canals and other artificial waterways, "L" for lakes and lochs, "G" for glaciers, "R" for reservoirs and artificial ponds, "S" for springs, and "W" for waterfalls, e.g. [[Category:Elbe basin|LAmselsee]] for the Amselsee.
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This category has the following 4 subcategories, out of 4 total.
Pages in category "Irtysh basin"
The following 10 pages are in this category, out of 10 total. This list may not reflect recent changes (learn more).