What is the highest elevation of a place where the lowest point is the Allaine River, National border?
CREATE TABLE "references" (
  "rank" real,
  "canton" text,
  "highest_point" text,
  "highest_elevation" text,
  "lowest_point" text,
  "lowest_elevation" text
);
SELECT "highest_elevation" FROM "references" WHERE "lowest_point"='allaine river, national border';