Only a couple in my world that I can think of:
The Spire: A column of obsidian rising from the sea and going WAY up into the sky. It once rose higher even but a large part fell into the sea. According to myth, the spire was caused by a dark god plunging his spear through the world and wounding it. The obsidian is the hardened blood of the world. In reality(?), the Spire was created when a hyper-velocity micrometeor hurtled through the planet from the other side. The Spire is, in a way, the hardened blood of the world. There is, on the other side of the planet, a vast plain of obsidian inhabited by fire giants and red dragons and other such creatures. The Spire itself has been carved into and contains a "seaside" town. Sea creatures such as mermen use the obsidian that has fallen into the sea for tools.
The Crownsea: A large sea that exists in a mountain range at a high elevation. Not all that unusual as fantasy terrain goes but not really something that occurs normally.