"A Suspension Bridge to Peace" (平和への架け橋, Heiwa e no Kakehashi, Viz: Viaduct to Peace) is chapter 509 of the original Naruto manga.
Konan and Tobi face off in Amegakure standing on a lake. Tobi asks what it is about Naruto that made Konan and Nagato quit Akatsuki, and Konan replies that he is light personified and carries a flower called 'hope'. Tobi tells Konan that he was the one who got Yahiko to found Akatsuki, and the one who gave Nagato the Rinnegan. Konan attacks Tobi in an attempt to kill them both. Konan recalls Yahiko, and Nagato calling each other the bridge to peace, and states that she will be the support to both their bridges. Konan then asks if Tobi understands why she betrayed him. He replies no, and she says it's because he's darkness, and a flower will wilt in darkness. She reveals her ultimate technique and splits the lake beneath them in two.