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"Mapa" is a noun which is often translated as "map", and "carta" is a noun which is often translated as "letter". Learn more about the difference between "mapa" and "carta" below.
el mapa()
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
a. map
El turista abrió un mapa frente al monumento.The tourist opened a map in front of the monument.
la carta()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).
a. letter
Ya no se escriben tantas cartas como antes.People do not write as many letters as they used to.
3. (card games)
4. (document)
a. charter
La Carta de las Naciones Unidas se firmó en 1945.The Charter of the United Nations was signed in 1945.