|ocean, river, grassland, mountain, forest
Muunilinst is the Muun homeworld and the headquarters of many important galactic corporations, including the InterGalactic Banking Clan (IGBC). It has a breathable atmosphere and a beautiful scenery, with large rolling plains, huge forests and long mountain lines. Though the large majority of the population is Muun, some inmigrated Humans and Iotrans can be found, as well as many traders and businessmen belonging to many different races.
The planet developed quickly as a key trading and financial centre as the Muun became a spacefaring race and founded many large corporations. The Muun have colonised other worlds which they keep as purse worlds, like the Neimoidians do, but Muunilinst is the only home they knew. The large Muun companies are based in enormous bustling cities with a very solemn architecture. Gleaming buildings and towers of marble, with dozens of pillars supporting them, shine against the warm sunlight the Muunilinst sun gives. These cities dot the plains here and there, and are the key centres of activity of the planet, which always has been full of starships travelling to and fro, carrying important businessmen. The largest buildings are the headquarters of important banking corporations, manufacturing companies and other businesses which employ thousands of Muun throughout the galaxy. Muunilinst was the site of several battles on land and space when it attempted to secede from the Old Republic, together with thousands of other systems, over two and a half decades ago. However, the Muun leaders of the separatist plot were captured and Muunilinst remained within the Republic.
The planet is nicknamed Moneylend, probably due to its wealth. 
Muunilinst is a lush world of forests, plains, and tall, jagged mountain peaks. It has a liquid iron core, a strong magnetic field, and was volcanically active throughout its known history. Its shallow oceans contain hundreds of "smokers", conical volcanoes built up by powerful vents in the crust. Many, though not all, of these smokers spew out superheated gases containing rich, pure precious metals from the planet's core. The very cones surrounding these vents are made up of layers of precious metals, mixed in with the mollusks, tube-worms, and bioluminescent ferns nurtured by the heat and water. It is these natural formations that provided the Muuns with the almost inexhaustible wealth to guarantee the credit of the entire galaxy. 
The greatest Muun city is Harnaidan, the headquarters of the IGBC. Built around a series of magnificent spires reaching four kilometers into the sky, Harnaidan has a population of more than fifty million. It is built above caverns containing vast, naturally heated lakes, enormous hot springs heated by magma vents. While the higher castes go about their daily business, lower castes swim through the rich waters, collecting mollusks and algae. 
A skyhook connects Harnaidan with High Port, an orbital city. The Golan space defense platforms defending Muunilinst can be seen from here, as well as a magnificent view of the planet glittering below. Mariunhus is a particularly rich city built around a smoker rich in gold, platinum, and other precious metals. Mariunhus is an example of a "vault-spire," a virtual mountain of wealth, kept safe and secure, which could be mined at a moment's notice to guarantee credit anywhere in the galaxy. Other smokers were known for industrial metals and were known as "mine-spires." 
The former subjects of the Rakata during the time of the Infinite Empire, the Muuns eventually achieved their independence. All throughout the Galactic Republic era, Muunilinst had a knack for funding potentially profitable enterprises throughout its sector, regardless of ethics or loyalty. It provided much of the funding for the nearby Human colony world of Sartinaynian. At some point in their history the Muuns also colonized the planet of Mygeeto, which much like Muunilinst itself would become wealthy and an important financial center. 
Eventually, both Muunilinst and Sartinaynian came to be member worlds in the Galactic Republic, and Muunilinst became one of the greatest financial powers in the galaxy. When the Republic established the Galactic Credit, the InterGalactic Banking Clan was its guarantor and distributor. The corruption of the Banking Clan was largely unchecked as the Republic fell into decline, and with the looming threat of the breakdown of law and order, they invested in thousands of droids to discourage customers from defaulting on their loans. 
References:  - http://starwars.wikia.com/wiki/Muunilinst