Silver Falls

Silver Falls is the waterfall that Gatherings take places at. There are several ledges in the cliff beside the waterfall and, going from the top down, these are the ranks that sit on each:

Leaders at the top, deputies beneath them, then medicine cats, then the mediators (not technically a ledge; just a big rock) and the messengers on the ground just beneath the cliffside.

There's also a cave behind the waterfall and, if you know where to find them, a series of tunnels/ledges in the cave that lead up to each leadership ledge. The entrances are hidden by ivy and most cats don't know of these secret routes.

How did Silver Falls gain its name?
In the early days of the Clans, back when the founders still ruled, there was a cat named Silver. Now Silver, Silver was really pretty. Turns out, when there's a pretty she-cat, toms fall in love with her. The toms in question, though, were Marsh and Horizon (aka Jayfeather and Alderheart/Ravenpaw.) Unsurprisingly, Silver was totally out of their league and preferred to hang out with Waterfall (aka an actual voice of reason.) In fact, she served as FallClan's first mediator.

Anyways, Marsh really, really liked Silver, so he decided to take out the competition, somehow forgetting (or not caring) that 'the competition' was his own brother. He formed an alliance with his sister, Oasis, in case he was driven to war.

Horizon, on the other hand, went straight for Silver. He offered her gifts, compliments, all the regular courtship things, trying to get her to like him. But being constantly stressed and paranoid isn't very attractive, so Silver totally rejected him. Deciding that this meant that she liked Marsh better than him, Horizon went to Orchid, begging for help. Orchid, who was watching this ship war distantly while trying to find herself a mate, waved him off like, "Yeah, yeah, you have my support, can you go check if _ is still single?"

And so the Clans were drawn into the closest thing to a war they've been in, with MarshClan and OasisClan on one side and HorizonClan and OrchidClan on the other. Waterfall didn't notice what was going on until just before the first battle, when Silver came to her, begging for help. Waterfall went straight to Marsh and yelled at him for awhile, asking why he thought it was okay to destroy their peace over a she-cat who wasn't even interested in him. Marsh ignored her and went ahead with the battle.

There were huge casualties on both sides, but neither Marsh nor Horizon was among them, so there was a second battle. This one took place at modern-day Silver Falls. After the fighting had gone on for some time, Marsh cornered Horizon in the cave behind the waterfall. He was about to kill his brother when Silver appeared and threw herself in front of Horizon. Marsh killed her before he could realize that she wasn't Horizon.

Both toms were devastated and called off the fighting. They created the Gatherings, a reminder every moon to keep the peace. They named the waterfall Silver Falls after the beautiful she-cat that so much blood had been spilled for.

Notes for myself:

 * Basically, Silver = Hera, Waterfall = Hestia, Marsh = Ares, Oasis = Athena (and Artemis), Orchid = Aphrodite, and Horizon = Ravenpaw.
 * Poor Horizon. He doesn't get the girl, he isn't a god, and his brother nearly kills him. This is a sad man.