The trek, which will also feature Bad Acid Trip, will run through Sept. 1 in Toronto.

System Of A Down will launch its previously announced tour with the Mars Volta Aug. 4-5 in Long Beach, Calif. The trek, which will also feature Bad Acid Trip, will run through Sept. 1 in Toronto. Pre-sale information can be found on SOAD's official Web site.

System's first major North American tour since 2002 comes in support of its new American/Columbia album, "Mezmerize," which debuted at No. 1 on The Billboard 200 last month and has already sold more than 827,000 copies in the United States, according to Nielsen SoundScan.

The Mars Volta's recent Universal set "Frances the Mute" debuted in March at a career-best No. 4 on The Billboard 200 and has shifted more than 347,000 copies to date.

Here are System Of A Down/Mars Volta tour dates:

Aug. 4-5: Long Beach, Calif. (Long Beach Arena)
Aug. 6: San Diego (Sports Arena)
Aug. 8: Phoenix (America West Arena)
Aug. 11: Dallas (American Airlines Center)
Aug. 12: San Antonio (SBC Arena)
Aug. 13: Houston (Mitchell Pavilion)
Aug. 15: Pensacola, Fla. (Civic Center)
Aug. 16: Orlando, Fla. (TD Waterhouse Arena)
Aug. 17: Miami (Office Depot Center)
Aug. 19: Atlanta (Gwinnett Arena)
Aug. 21: Hampton, Va. (Hampton Coliseum)
Aug. 22: Baltimore (Baltimore Arena)
Aug. 23: East Rutherford, N.J. (Continental Airlines Arena)
Aug. 26: Philadelphia (Wachovia Center)
Aug. 29: Montreal (Belle Centre)
Aug. 30: Quebec City, Quebec (Pepsi Coliseum)
Sept. 1: Toronto (Air Canada Centre)