SXM is the city abbreviation for which location?

The abbreviation SXM corresponds specifically to St. Maarten. This is recognized internationally in the aviation and travel industries for its airport, Princess Juliana International Airport (SXM), which is known for its proximity to stunning beaches and its unique landing approach that passes low over Maho Beach.

While the other choices represent real locations, they do not share the SXM code. San Marcos, Texas, Salzburg, Austria, and Santa Monica, California, have their own distinct airport codes that are different from SXM. Thus, St. Maarten is the correct choice as it is the only location directly linked to that abbreviation within the context of airports and travel.