I was confused why the Ushiro-Tateyama mountain range (from Jiigatake to Mt Shirouma) is called what it is. It means “rear Tateyama” which is weird from my point of view: isn’t it in front of Tateyama? The name of course would come from the other (Toyama) side, but it still feels weird.
A while back I walked into a bookshop and I spotted a mountain magazine focusing on the so-called kiretto of the country. These are gaps in the mountain range, often very “deep” cols with pretty tough terrain. This magazine named three as the “big three” of Japan: the Hachimine col between Mt Kashima-yari and Mt Goryuu, the Kaerazu col between Mt Karamatsu and Mt Shirouma, and the “great” dai-kiretto between Mt Hotaka and Mt Yari.