When you are talking about where [something/someone] is in Spanish, you use the verb estar + [location].
Take a look at these examples:
Hoy estoy en el campo.Today I am in the countryside.
¿Estás en casa?Are you at home?
El estadio está en México DF.The stadium is in Mexico City.
Nosotros estamos en París esta semana.We are in Paris this week.
¿Estáis en el trabajo?Are you at work?
Mis hermanos están en la playa.My brothers are at the beach.
You can never use ser in this context!
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