Rivalries are a huge part of what makes the NHL so much fun to watch.
Teams that don't like each other make for a more intense and more entertaining game full of hard hits, drag 'em-out fights and passionate fans on each side.
There are many factors that go into making a great rivalry. Geographic location is certainly a factor. When two teams are not separated by many miles, their fans interact more and get into a friendly (or not-so-friendly) competition. The fact that teams in the Eastern Conference are located closer together geographically is one reason there are more traditional rivalries in that conference.
Having the two teams play in the same division also helps. It allows them to play against each other more often, and the fact that the teams are competing for first place in the division and one of the top three seeds in the playoffs each year also helps create bad blood between them.
Tradition and a history of playing playoff series against another team also helps. If you play a best-of-seven series against another team. bad blood is more likely to develop (remember the Wings and Avs in the late 1990s and early 2000s). The intensity level is higher in the postseason, more is at stake and playing the same team so many times in a row—well, familiarity often breeds contempt.
With that in mind, here are 13 NHL rivalries that will never get old.