In the Vinony graph
Vinony's link graph records 68 inbound references to Sumka, and connects out to Tatarstan, Russia and Russian.
The entry is geolocated on the map in RU, across 2 mapped points.
It is catalogued under topics including Rivers of Tatarstan and Tributaries of the Volga.
Vinony links it to 8 Wikipedia language editions.
On the map
2 mapped locations