CREATE TABLE table_1416612_1 (highest_point VARCHAR, lowest_point VARCHAR)

what's the highest point with lowest point being belle fourche river at south dakota border
SELECT highest_point FROM table_1416612_1 WHERE lowest_point = "Belle Fourche River at South Dakota border"
SELECT "highest_point" FROM "table_1416612_1" WHERE "Belle Fourche River at South Dakota border" = "lowest_point"