Hapi presided over an annual event at one of these locations in Egypt.
The Queen Mother of the Goguryeo dynasty was supposedly the daughter of a god of one of these things who gave a diagram to Yu the Great. Hapi presided over an annual event at one of these locations in Egypt. A god of one of these locations tried to kill Achilles three times, only to be stopped by Hephaestus's flames. One of these locations was descended to Earth from Shiva's hair. To win his wife, Heracles cut off the horn of a god of one of these locations named Achelous. The most binding Greek oaths were sworn on one of these locations which the recently-deceased would cross with the assistance of Charon. For 10 points, name these locations which in Greek mythology include the Lethe and the Styx.
The Queen Mother of the Goguryeo dynasty was supposedly the daughter of a god of one of these things who gave a diagram to Yu the Great.
rivers [or river gods or anything mentioning deities that rule over rivers; accept the Yellow River or Huang He or Hebo, Scamander River, Nile River, Ganges River, Achelous River before mention, or the River Styx]