Name the most municipalities for alto alentejo province (partly ribatejo)
CREATE TABLE "table1_221375_1" (
  "district" text,
  "municipalities" real,
  "parishes" real,
  "province_of_1936" text,
  "region" text
);
SELECT MAX("municipalities") FROM "table1_221375_1" WHERE "province_of_1936"='Alto Alentejo Province (partly Ribatejo)';