The western shorelands of the Mistmere held the greatest concentration of hot springs, geysers and mud pots in the valley, and so were named Urdalf, "the Hot Field", by the Noldor. Little or no vegetation grew in immediate proximity to these boiling waters, and many stretches of the stony expanse were perilous to cross, though the Noldor had learned all of the safe paths across them. They took advantage of the natural heats and rich mineral content of this area to assist their metalsmiths in the forging of weapons and other implements for which they had need. Nestador, Master of the Cuiviémar, also made use of some of the less scalding springs for his legendary healing arts. 

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