When 106 is the area in kilometers squared what is the city/municipality?
CREATE TABLE "table1_29289372_1" (
  "city_municipality" text,
  "population_2010" real,
  "area_km" text,
  "pop_density_per_km" text,
  "income_classification" text
);
SELECT "city_municipality" FROM "table1_29289372_1" WHERE "area_km"='106';