Senraq is the ship for Avatar Korra's parents, Senna and Tonraq, in "The Legend of Korra". While not much is known about Senna and Tonraq, Senraq is, without a doubt, the most perfect ship in "The Legend of Korra" because of the fact that their love produced the new Avatar.
That and the fact that without Senraq, Makorra or any other ships involving Korra would never happen.
"Oh my gosh, you ship Senraq?!"
"Yeah! Aren't they just perfect together?"
"I know, right? Best LoK ship, just sayin'."
"Oh I totally agree."