'Stain' or '[woodland] scrub' may be English equivalents of 'La Macchia'. Whatever the translation, the word 'macchia' is a feminine noun whose definite article is 'la' ['the'] and whose indefinite article is 'una' ['a, one']. The phrase is pronounced 'lah MAHK-kyah'.
Salta la macchia! in Italian means "Jump over the spot!" in English.
La bocca in Italian is "the mouth" in English.
La bella in Italian means "the beautiful" in English.
La cucina in Italian means "the kitchen" in English.
La vita in Italian means "the life" in English.
La libertà in Italian means "liberty" in English.
La volpe in Italian means "the fox" in English.
La padrona in Italian means "the mistress" in English.
La gamba in Italian means "the leg" in English.
La chiesa in Italian means "the church" in English.
La means "the" so la rosa is "the rose" when translated from Catalan, Italian or Spanish to English.
"Prairie" in English (la) prateria in Italian.