Need Some Help Regarding 6 Kingdoms

According to this: https://awoiaf.westeros.org/index.php/Seven_Kingdoms#Regions_and_Territory the original Seven Kingdoms consisted of nine provinces, rather than seven, and included (going north to south)

- The North (ruled by the Starks)
- The Riverlands
- The Vale
- The Westerlands (ruled by the Lannisters)
- The Iron Islands
- The Crownlands (where King's Landing is)
- The Stormlands
- The Reach (home of the Tyrells)
- Dorne

As we all know, that all changed throughout the course of both the book and the tv series. In fact, I'm amazed that they kept the peace as long as they did during King Robert's reign. Westeros seems so volatile that everyone seems to want to go to war all the time.

There are six kingdoms with new people heading them.

Robin Arryn - the Kingdom of the Mountain and the Vale
Yara - the Kingdom of the Isles and the Rivers
Tyrion - the Kingdom of the Rock
Gendry Baratheon - the Kingdom of the Stormlands
Bronn - the Kingdom of the Reach
new prince - the Principality of Dorne

The "Seven Kingdoms" refers to the seven sovereign entities at the time of Aegon's Conquest: the North, the Vale, the Westerlands, the Iron Islands, the Stormlands, the Reach, and Dorne. At that time, the Riverlands were part of the Iron Islands, and the Crownlands were claimed by the Stormlands. Eventually, the Riverlands separated from the Iron Islands, but the Crownlands never became their own entity -- they're no longer claimed by the Stormlands, but remain under direct control of the current monarch (they really are the "Crown's lands").

So, officially, the Six Kingdoms are the Vale, the Westerlands, the Iron Islands, the Stormlands, the Reach, and Dorne. Although, given the amount of prominence and authority that the lord of Riverrun currently has, the Riverlands could replace the North and make it the Seven Kingdoms again.