'Long' is the one-character abbreviation for Gansu Province.
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history
陇 is not a general word; it is a fixed geographic name. It first named 陇山 (Mount Long) on the Shaanxi-Gansu border, then became the abbreviation for Gansu, seen in the rail line 陇海铁路. The mound radical 阝 marks high terrain; 龙 supplies the sound.
culture
The saying 得陇望蜀 ('take Long and then covet Shu') uses this name to mean insatiable greed.