How many seasons did the Sci-Fi television show "Stargate Atlantis" have?

The science fiction television show Stargate Atlantis had 5 seasons because that was the intended run of the series as planned by the show's creators and producers. The decision to end the show after the 5th season was likely based on factors such as storyline progression, viewer ratings, and overall production costs. While the show garnered a dedicated fan base, the 5-season run allowed for a complete narrative arc and gave the creators the opportunity to wrap up the storylines in a satisfactory manner.