Dragon's Cave, Cardia Islands (1n)

The home of the Dragons and Bahamut.

Cornelia, Coneria (1n)

The large town where you start also has a large castle whose princess has been captured by an evil knight.

Crescent Lake

The home of Lukin and the Circle of Sages.

Elfheim, Elfland (1n)

Home of the elves. Duh.

Gaia

A town in the north houses a fairy's spring.

Ice Cavern, Ice Cave (1n)

The sleeping place of the Floater stone.

Lufenia, Lefein (1n)

This town is populated with ancient warriors who don't speak English.

Marsh Cave

The hiding place of the Crown.

Matoya's Cave

Self-explanatory, I think.

Melmond

A town whose earth and people are rotting away. Dr. Unne lives here.

Tower of Mirage, Mirage Tower (1n)

Getting to the top of this lets you reach the Flying Fortress.

Mount Duergar, Dwarf Cave (1n)

Home of the dwarfs, who build canals and make swords.

Mount Gulg, Gurgu Volcano (1n)

Home of Kary, the Fire Fiend.

Onlak, Onrac (1n)

This town has a submarine leading to the Sunken Shrine.

Citadel of Trials, Ordeal Castle (1n)

Complete this to get the Rat's Tail. Compare with Mount Ordeals (4).

Pravoca, Pravoka (1n)

A port town which has been overrun by pirates.

Sage's Cave, Sarda's Cave (1n)

The home of Sarda the Sage, who'll give you a Rod.

Sunken Shrine, Sea Shrine (1n)

This is the home of the mermaids and of Kraken, the Water Fiend.

Flying Fortress, Sky Castle (1n)

The home of Tiamat, the Air Fiend.

Temple Of Chaos, Temple of Fiends (1n)

The home of Garland the errant knight who kidnapped Sarah is also the gateway to 2000 years ago by way of a black Orb. At the end of it resides Garland/Chaos.

Terra Cavern, Earth Cave (1n)

Lair of the Vampire and Lich, the Earth Fiend.

Titan's Cave, Titan's Tunnel (1n)

Titan guards this passage to Sarda the Sage.

Waterfall Cavern, Waterfall (1n)

A robot here will give you a Cube.

Western Keep, Northwest Castle (1n)

The home of Astos.