Naboo

An idyllic world close to the border of the Outer Rim Territories, Naboo is inhabited by peaceful humans known as the Naboo, and an indigenous species of intelligent amphibians called the Gungans.
Naboo's surface consists of swampy lakes, rolling plains and green hills. Its population centers are beautiful -- Naboo's river cities are respendlent with classical architecture and greenery, while the underwater Gungan settlements are a beautiful display of exotic hydrostatic bubble technology.
Naboo is a geologically unique world. It lacks a molten core, indicative of an ancient world. The planet is a conglomerate of large rocky bodies permeated by countless caves and tunnel networks. This causes numerous swampy lakes on the surface, which lead deeper into the planet's structure. The native Gungans have developed transports that exploit these cave networks, but even these hardy explorers pause at venturing too deep into the planet core, for it is infested with gargantuan sea beasts with ravenous appetites.